icons: Clean up search.svg

Remove metadata and clean up the SVG tags to make it simpler.

src/default-theme/icons/md/search.svg

@@ -1,13 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 19.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 18 18" style="enable-background:new 0 0 18 18;" xml:space="preserve">
-<style type="text/css">
-	.st0{fill:#FFFFFF;}
-	.st1{fill:none;}
-</style>
-<path class="st0" d="M12.1,10.9h-0.7l-0.2-0.2c0.8-0.9,1.3-2.2,1.3-3.5c0-3-2.4-5.4-5.4-5.4S1.8,4.2,1.8,7.1s2.4,5.4,5.4,5.4
-	c1.3,0,2.5-0.5,3.5-1.3l0.2,0.2v0.7l4.1,4.1l1.2-1.2L12.1,10.9z M7.1,10.9c-2.1,0-3.7-1.7-3.7-3.7s1.7-3.7,3.7-3.7s3.7,1.7,3.7,3.7
-	S9.2,10.9,7.1,10.9z"/>
-<path class="st1" d="M0,0h18v18H0V0z"/>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 18 18">
+    <path fill="#FFFFFF" d="M12.1,10.9h-0.7l-0.2-0.2c0.8-0.9,1.3-2.2,1.3-3.5c0-3-2.4-5.4-5.4-5.4S1.8,4.2,1.8,7.1s2.4,5.4,5.4,5.4
+        c1.3,0,2.5-0.5,3.5-1.3l0.2,0.2v0.7l4.1,4.1l1.2-1.2L12.1,10.9z M7.1,10.9c-2.1,0-3.7-1.7-3.7-3.7s1.7-3.7,3.7-3.7s3.7,1.7,3.7,3.7
+        S9.2,10.9,7.1,10.9z"/>
+    <path fill="none" d="M0,0h18v18H0V0z"/>
 </svg>