wpcept: fill user login field twice

The first time it is filled, it sometimes isn't ready to receive the
keystrokes yet, and may end up as `dmin` instead of `admin`. Filling it
twice seems to avoid this, and prevent random test failures.

See WordPoints/wordpoints#526

wpcept/includes/AcceptanceTester.php

@@ -48,6 +48,8 @@ public function amLoggedInAsAdminOnPage( $page ) {
 		$this->amOnPage(
 			add_query_arg( 'redirect_to', rawurlencode( $page ), '/wp-login.php' )
 		);
+
+		$this->fillField( '#user_login', 'admin' );
 		$this->fillField( '#user_login', 'admin' );
 		$this->fillField( '#user_pass', 'password' );
 		$this->click( '#wp-submit' );
@@ -81,6 +83,8 @@ public function waitUntilElementInteractable( $element, $timeout = null ) {
 
 				} catch ( \Facebook\WebDriver\Exception\InvalidElementStateException $e ) {
 
+				} catch ( \Exception $e ) {
+
 					codecept_debug(
 						'Error while waiting for new reaction:' . $e->getMessage()
 					);