search: Tweak the sizes of search results icons

Just a small tweak of icon sizes, in order to make
them look like in the mockup.

https://bugzilla.gnome.org/show_bug.cgi?id=749957

js/ui/search.js

@@ -72,7 +72,7 @@ const ListSearchResult = new Lang.Class({
     Name: 'ListSearchResult',
     Extends: SearchResult,
 
-    ICON_SIZE: 64,
+    ICON_SIZE: 24,
 
     _init: function(provider, metaInfo) {
         this.parent(provider, metaInfo);
@@ -684,7 +684,7 @@ const ProviderInfo = new Lang.Class({
     Name: 'ProviderInfo',
     Extends: St.Button,
 
-    PROVIDER_ICON_SIZE: 48,
+    PROVIDER_ICON_SIZE: 32,
 
     _init: function(provider) {
         this.provider = provider;