Use deafult cursor line number hover (fixes #85176, related #86708)

src/vs/editor/browser/viewParts/lineNumbers/flipped-cursor-2x.svg

-<svg xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="30" height="50" viewBox="0 0 30 50" style="enable-background:new 0 0 30 50;"><polygon style="fill:#FFFFFF;stroke:#000000;stroke-width:2;" points="29,2.4 3.8,27.6 14,27.6 6.4,43 12.6,45 20.2,29.8 29,36"/></svg>

src/vs/editor/browser/viewParts/lineNumbers/flipped-cursor-mac-2x.svg

-
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 26 38" style="enable-background:new 0 0 26 38;" width="26" height="38"><style type="text/css">.st0{stroke:#FFFFFF;stroke-miterlimit:10;}</style>	<title>flipped-cursor-mac</title><path class="st0" d="M10.6,33.2l3.2-9.4H4.2L25,2.4v28.8L19.4,26l-3.2,9.2c-0.4,1-1.6,1.6-2.6,1.2L12,35.8 C10.8,35.4,10.2,34.4,10.6,33.2z"/></svg>

src/vs/editor/browser/viewParts/lineNumbers/flipped-cursor-mac.svg

-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 13 19" style="enable-background:new 0 0 13 19;" width="13" height="19"><style type="text/css">.st0{stroke:#FFFFFF;stroke-miterlimit:10;}</style><title>flipped-cursor-mac</title><path class="st0" d="M5.3,16.6l1.6-4.7H2.1L12.5,1.2v14.4L9.7,13l-1.6,4.6c-0.2,0.5-0.8,0.8-1.3,0.6L6,17.9 C5.4,17.7,5.1,17.2,5.3,16.6z"/></svg>

src/vs/editor/browser/viewParts/lineNumbers/flipped-cursor.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="15" height="25" x="0px" y="0px" viewBox="0 0 15 25" style="enable-background:new 0 0 15 25;"><polygon style="fill:#FFFFFF;stroke:#000000" points="14.5,1.2 1.9,13.8 7,13.8 3.2,21.5 6.3,22.5 10.1,14.9 14.5,18"/></svg>
\ No newline at end of file

src/vs/editor/browser/viewParts/lineNumbers/lineNumbers.css

@@ -19,20 +19,6 @@
 	width: 100%;
 }
 
-.monaco-editor .margin-view-overlays .line-numbers {
-	cursor: -webkit-image-set(
-		url('flipped-cursor.svg') 1x,
-		url('flipped-cursor-2x.svg') 2x
-	) 30 0, default;
-}
-
-.monaco-editor.mac .margin-view-overlays .line-numbers {
-	cursor: -webkit-image-set(
-		url('flipped-cursor-mac.svg') 1x,
-		url('flipped-cursor-mac-2x.svg') 2x
-	) 24 3, default;
-}
-
 .monaco-editor .margin-view-overlays .line-numbers.lh-odd {
 	margin-top: 1px;
 }