Button (grid): reverting changes of commit c71642b because it has dow…

…nsides (select and checkbox/radio buttons don't get margin because they are wrapped in a div)

css/structure/jquery.mobile.button.css

@@ -1,7 +1,7 @@
 .ui-btn { display: block; text-align: center; cursor:pointer; position: relative; margin: .5em 0; padding: 0; }
 .ui-mini { margin-top: .25em; margin-bottom: .25em; }
 .ui-btn-left, .ui-btn-right, .ui-input-clear, .ui-btn-inline,
-.ui-block-a > .ui-btn, .ui-block-b > .ui-btn, .ui-block-c > .ui-btn, .ui-block-d > .ui-btn, .ui-block-e > .ui-btn { margin-right: 5px; margin-left: 5px; }
+.ui-grid-a .ui-btn, .ui-grid-b .ui-btn, .ui-grid-c .ui-btn, .ui-grid-d .ui-btn, .ui-grid-e .ui-btn, .ui-grid-solo .ui-btn { margin-right: 5px; margin-left: 5px; }
 .ui-btn-inner { font-size: 16px; padding: .6em 20px; min-width: .75em; display: block; position: relative; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; zoom: 1; }
 .ui-btn input, .ui-btn button { z-index: 2; }
 .ui-btn-left, .ui-btn-right, .ui-btn-inline { display: inline-block; vertical-align: middle; }