Dialog: Removed CSS rules for button styling - let the button plugin …

…handling that. Fixes #5779 - Themeroller - size inconsistency with button widgets and dialog box buttons.

themes/base/jquery.ui.dialog.css

@@ -15,6 +15,6 @@
 .ui-dialog .ui-dialog-titlebar-close:hover, .ui-dialog .ui-dialog-titlebar-close:focus { padding: 0; }
 .ui-dialog .ui-dialog-content { position: relative; border: 0; padding: .5em 1em; background: none; overflow: auto; zoom: 1; }
 .ui-dialog .ui-dialog-buttonpane { text-align: left; border-width: 1px 0 0 0; background-image: none; margin: .5em 0 0 0; padding: .3em 1em .5em .4em; }
-.ui-dialog .ui-dialog-buttonpane button { float: right; margin: .5em .4em .5em 0; cursor: pointer; padding: .2em .6em .3em .6em; line-height: 1.4em; width:auto; overflow:visible; }
+.ui-dialog .ui-dialog-buttonpane button { float: right; margin: .5em .4em .5em 0; cursor: pointer; }
 .ui-dialog .ui-resizable-se { width: 14px; height: 14px; right: 3px; bottom: 3px; }
 .ui-draggable .ui-dialog-titlebar { cursor: move; }