debug: polish breakpoints glyphs.

src/vs/workbench/parts/debug/browser/media/breakpoint-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="#007ACC" fill-opacity=".4"><circle cx="8" cy="8" r="5"/></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/breakpoint-disabled-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke="#007ACC" stroke-width="2" stroke-opacity=".4"><circle cx="8" cy="8" r="4"/></g></g></svg>
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+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke="#5A5A5A" stroke-width="3" stroke-opacity="0.8"><circle cx="8" cy="8" r="4"/></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/breakpoint-disabled.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke="#007ACC" stroke-width="2" stroke-opacity=".4"><circle cx="8" cy="8" r="4"/></g></g></svg>
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+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke="#6C6C6C" stroke-width="3" stroke-opacity="0.6"><circle cx="8" cy="8" r="4"/></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/breakpoint-verified-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="#007ACC"><circle cx="8" cy="8" r="5"/></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/breakpoint.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="#007ACC" fill-opacity=".4"><circle cx="8" cy="8" r="5"/></g></g></svg>
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+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke="#007ACC" stroke-width="3" stroke-opacity="0.8"><circle cx="8" cy="8" r="4"/></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/debug.contribution.css

@@ -267,18 +267,10 @@
 	background: rgba(255, 255, 0, 0.15);
 }
 
-.monaco-editor.vs-dark .debug-breakpoint-glyph-hint {
-	background: url('breakpoint-dark.svg') center center no-repeat;
-}
-
 .monaco-editor.vs-dark .debug-breakpoint-glyph-disabled {
 	background: url('breakpoint-disabled-dark.svg') center center no-repeat;
 }
 
-.monaco-editor.vs-dark .debug-breakpoint-glyph-verified {
-	background: url('breakpoint-verified-dark.svg') center center no-repeat;
-}
-
 .monaco-editor.vs-dark .debug-top-stack-frame-glyph {
 	background: url('current-arrow-dark.svg') center center no-repeat;
 }
@@ -287,10 +279,6 @@
 	background: url('stackframe-arrow-dark.svg') center center no-repeat;
 }
 
-.monaco-editor.vs-dark .debug-breakpoint-glyph {
-	background: url('breakpoint-dark.svg') center center no-repeat;
-}
-
 .monaco-editor.vs-dark .debug-top-stack-frame-glyph.debug-breakpoint-glyph-verified {
 	background: url('current-and-breakpoint-dark.svg') center center no-repeat;
 }