Skip AddMissingVarNameFixer for property assignments

[TomasVotruba]

AddMissingVarNameFixer grabbed the wrong token as the variable name in two cases.

Property assignment

Above a $this->prop = ... assignment, the next T_VARIABLE is $this, so the fixer wrote @var int $this.

 final class SomeClass
 {
     public function run()
     {
-        /** @var int */
+        /** @var int $this */
         $this->value = 1000;
     }
 }

Now skipped when the variable is followed by -> (property access).

Annotations (regression guard)

Docblock annotations like @Entity or @\Doctrine\ORM\Mapping\Entity were already skipped (the regex requires a literal var), but this had no test. Added a fixture to lock the behavior — these are left untouched:

/** @Entity */
private $first;

/** @\Doctrine\ORM\Mapping\Entity */
private $second;