Twenty Ten: Prevent Block Inserter icon color override.

This changeset prevents the likes of `body * { color: #000; }` in custom styles to override the Block Inserter icon styles.

Props umesh84, kajalgohel, sabernhardt, pooja1210, amin7.
Fixes #57414.




git-svn-id: https://develop.svn.wordpress.org/trunk@56081 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyten/editor-blocks.css

@@ -373,3 +373,9 @@ p.has-drop-cap:not(:focus)::first-letter {
 :root .editor-styles-wrapper .has-white-background-color:visited {
 	background-color: #fff;
 }
+
+/* Inserter Icon */
+
+.editor-styles-wrapper .block-editor-inserter path {
+	color: #fff;
+}