remove UnknownDeviceDialog gemini specific css

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

res/css/views/dialogs/_UnknownDeviceDialog.scss

@@ -14,14 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// CSS voodoo to support a gemini-scrollbar for the contents of the dialog
-.mx_Dialog_unknownDevice .mx_Dialog {
-    // ideally we'd shrink the height to fit when needed, but in practice this
-    // is a pain in the ass. plus might as well make the dialog big given how
-    // important it is.
-    height: 100%;
-}
-
 .mx_UnknownDeviceDialog {
     height: 100%;
     display: flex;