Improve style of DialogSidebar (of live location map) (#8760)

Author: luixxiul

res/css/components/views/beacon/_DialogSidebar.scss

@@ -29,34 +29,29 @@ limitations under the License.
 
     background-color: $background;
     box-shadow: 0px 4px 4px $menu-box-shadow-color;
-}
-
-.mx_DialogSidebar_header {
-    display: flex;
-    flex-direction: row;
-    align-items: center;
-    justify-content: space-between;
-
-    flex: 0 0;
-    margin-bottom: $spacing-16;
-
-    color: $primary-content;
-}
-
-.mx_DialogSidebar_closeButton {
-    @mixin ButtonResetDefault;
-}
-
-.mx_DialogSidebar_closeButtonIcon {
-    color: $tertiary-content;
-    height: 12px;
-}
 
-.mx_DialogSidebar_list {
-    list-style: none;
-    padding: 0;
-    margin: 0;
-    flex: 1 1 0;
-    width: 100%;
-    overflow: auto;
+    .mx_DialogSidebar_header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+
+        flex: 0 0;
+        margin-bottom: $spacing-16;
+
+        color: $primary-content;
+
+        .mx_DialogSidebar_closeButtonIcon {
+            color: $tertiary-content;
+            height: 12px;
+        }
+    }
+
+    .mx_DialogSidebar_list {
+        list-style: none;
+        padding: 0;
+        margin: 0;
+        flex: 1 1 0;
+        width: 100%;
+        overflow: auto;
+    }
 }