Improve $node name get on static or method call

[TomasVotruba]

Before

[ERROR] Could not process "abz/SomeClass.php" file, due to:                                                            
         "Pick more specific node than "PhpParser\Node\Expr\MethodCall"

After

[ERROR] Could not process "abz/SomeClass.php" file, due to:                                                            
         "Pick more specific node than "PhpParser\Node\Expr\MethodCall", e.g. "$node->name"                             
                                                                                                                        
         Caused in "abz/SomeClass.php" file on line 9 on code "$this->foo()".     
         Look at "InnerRectorClass.php:35"