Correct size for "Google" in search widget.

Fixes http://b/issue?id=2100799 .

Used official logo from creativelab.corp, specifically
https://creativelab.corp.google.com/brandsite/logo-files/Glogo_flat_black.eps

...at 27% opacity, matching the original mdpi version.  Updated the mdpi
version using the same source artwork so they're consistent.

src/com/android/launcher2/Search.java

@@ -320,7 +320,7 @@ public class Search extends LinearLayout
     }
 
     /**
-     * If appropriate & available, configure voice search
+     * If appropriate & available, configure voice search
      * 
      * Note:  Because the home screen search widget is always web search, we only check for
      * getVoiceSearchLaunchWebSearch() modes.  We don't support the alternate form of app-specific