DRY: light theme sass mixin (#4606)

Signed-off-by: Roman <ixrock@gmail.com>

src/renderer/port-forward/port-forward-dialog.tsx

@@ -145,14 +145,12 @@ export class PortForwardDialog extends Component<Props> {
           </div>
           <Checkbox
             data-testid="port-forward-https"
-            theme="light"
             label="https"
             value={dialogState.useHttps}
             onChange={value => dialogState.useHttps = value}
           />
           <Checkbox
             data-testid="port-forward-open"
-            theme="light"
             label="Open in Browser"
             value={dialogState.openInBrowser}
             onChange={value => dialogState.openInBrowser = value}