Use default cursor for .git-statusbar-item

Prevent the text selection cursor from showing on .git-statusbar-item. This is
happening because there is an   being used currently to position the
element.

Fixes #307

src/vs/workbench/parts/git/browser/media/git.contribution.css

@@ -226,6 +226,7 @@
 	background-repeat: no-repeat;
 	background-position: 4px 50%;
 	background-size: 17px;
+	cursor: default;
 	padding: 0 5px 0 22px;
 }
 
@@ -248,4 +249,4 @@
 
 .monaco-shell .git-statusbar-item.headless {
 	font-style: italic;
-}
+}