Trigger change on avatar delete

lib/private/avatar.php

@@ -137,6 +137,7 @@ class Avatar implements IAvatar {
 				$avatar->delete();
 			}
 		}
+		$this->user->triggerChange();
 	}
 
 	/**

tests/lib/avatartest.php

@@ -163,7 +163,8 @@ class AvatarTest extends \Test\TestCase {
 			->method('putContent')
 			->with($image->data());
 
-		$this->user->expects($this->once())->method('triggerChange');
+		// One on remove and once on setting the new avatar
+		$this->user->expects($this->exactly(2))->method('triggerChange');
 
 		$this->avatar->set($image->data());
 	}