move editor padding to edit specific style file

as it will be different for the main composer

res/css/views/rooms/_BasicMessageComposer.scss

@@ -17,7 +17,6 @@ limitations under the License.
 
 .mx_BasicMessageComposer {
     .mx_BasicMessageComposer_input {
-        padding: 3px 6px;
         white-space: pre-wrap;
         word-wrap: break-word;
         outline: none;

res/css/views/rooms/_EditMessageComposer.scss

@@ -30,6 +30,7 @@ limitations under the License.
         border: solid 1px $primary-hairline-color;
         background-color: $primary-bg-color;
         max-height: 200px;
+        padding: 3px 6px;
 
         &:focus {
             border-color: $accent-color-50pct;