Fixed topic field resizing

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

res/css/views/settings/_ProfileSettings.scss

@@ -14,6 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+.mx_ProfileSettings_controls_topic {
+    & > textarea {
+        resize: vertical;
+    }
+}
+
 .mx_ProfileSettings_profile {
     display: flex;
 }