Bundled Themes: Twenty Eleven & Twenty Twelve dropdown category widget exceeds parent div when strings are long enough.

Fixes the width of the category dropdown by limiting the width of `select` items in widgets using `max-width: 100%`.

Props gma992, karmatosed.
Fixes #37926.

git-svn-id: https://develop.svn.wordpress.org/trunk@47801 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyeleven/style.css

@@ -1846,6 +1846,9 @@ video {
 .widget a:active {
 	text-decoration: underline;
 }
+.widget select {
+	max-width: 100%;
+ }
 
 /* Search Widget */
 .widget_search form {

src/wp-content/themes/twentytwelve/style.css

@@ -1417,6 +1417,9 @@ a.comment-edit-link:hover {
 /* =Widgets
 -------------------------------------------------------------- */
 
+.widget select {
+	max-width: 100%;
+ }
 .widget-area .widget ul ul {
 	margin-left: 12px;
 	margin-left: 0.857142857rem;