Disallow invalid inline style comments in stylesheets (#9099)

res/css/structures/_RoomSearch.pcss

@@ -14,18 +14,18 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Note: this component expects to be contained within a flexbox
+/* Note: this component expects to be contained within a flexbox */
 .mx_RoomSearch {
     flex: 1;
     min-width: 0;
     border-radius: 8px;
     background-color: $panel-actions;
-    // keep border thickness consistent to prevent movement
+    /* keep border thickness consistent to prevent movement */
     border: 1px solid transparent;
     height: 28px;
     padding: 1px;
 
-    // Create a flexbox for the icons (easier to manage)
+    /* Create a flexbox for the icons (easier to manage) */
     display: flex;
     align-items: center;
 
@@ -48,7 +48,7 @@ limitations under the License.
         color: $tertiary-content;
         flex: 1;
         min-width: 0;
-        // the following rules are to match that of a real input field
+        /* the following rules are to match that of a real input field */
         overflow: hidden;
         margin: 9px;
         font-weight: $font-semi-bold;