[wpmlbridge-295] Remove undefined variable.

See #43

See https://onthegosystems.myjetbrains.com/youtrack/issue/wpmlbridge-295

src/Sync/Dashboard.php

@@ -101,7 +101,7 @@ private function prepare() {
 	private function maybePutMapping() {
 		$putMapping = ! empty( $_REQUEST['put_mapping'] );
 
-		if ( ( $putMapping || $forcePutMapping ) && false === $this->status->get('putMapping') ) {
+		if ( $putMapping && false === $this->status->get('putMapping') ) {
 			$this->indicesManager->clearAllIndices();
 			$this->status->set('putMapping', true);
 		}