debug: small css cleanup

src/vs/workbench/parts/debug/browser/media/debugHover.css

@@ -19,15 +19,10 @@
 	animation-duration: 0.15s;
 	animation-name: fadeIn;
 	word-wrap: break-word;
+	-webkit-user-select: text;
 
 	white-space: pre;
 
-	-webkit-user-select: text;
-	-ms-user-select: text;
-	-khtml-user-select: text;
-	-moz-user-select: text;
-	-o-user-select: text;
-
 	overflow: hidden;
 }
 
@@ -37,7 +32,7 @@
 }
 
 .monaco-editor .debug-hover-widget .debug-hover-tree .monaco-tree .monaco-tree-row > .content {
-	-webkit-user-select: initial;
+	-webkit-user-select: text;
 }
 
 /* Disable tree highlight in debug hover tree. */

src/vs/workbench/parts/debug/browser/media/debugViewlet.css

@@ -71,9 +71,6 @@
 	line-height: 18px;
 
 	-webkit-user-select: text;
-	-moz-user-select: text;
-	-o-user-select: text;
-	-ms-user-select: text;
 }
 
 .debug-viewlet .debug-message-box.exception {

src/vs/workbench/parts/debug/browser/media/repl.css

@@ -28,7 +28,7 @@
 .monaco-workbench .repl .repl-tree .monaco-tree .monaco-tree-row > .content {
 	line-height: 18px;
 	word-wrap: break-word;
-	-webkit-user-select: initial;
+	-webkit-user-select: text;
 }
 
 .monaco-workbench .repl .repl-tree .monaco-tree-row .input.expression.mac,