Core CSS: Unset browser default min-width for fieldset. Fixes #6077.

The min-width was causing issues in combination with white-space nowrap to get an ellipsis.

Author: jaspermdegroot

css/structure/jquery.mobile.core.css

@@ -12,6 +12,9 @@
 .ui-mobile fieldset {
 	border-width: 0;
 }
+.ui-mobile fieldset {
+	min-width: 0;
+}
 /* Viewport */
 .ui-mobile-viewport {
 	margin: 0;