[TASK] Remove obsolete prepareArguments() call

As suspected in the todo annotation, this call is obsolete: In the next line,
`$this->parseArguments()` is called, which calls
`ViewHelperResolver::getArgumentDefinitionsForViewHelper()` in its first
line, which then calls (and returns the result of `prepareArguments()`.

Author: s2b

src/Core/Parser/TemplateParser.php

@@ -294,8 +294,6 @@ protected function openingViewHelperTagHandler(ParsingState $state, string $name
         }
 
         $viewHelper = $viewHelperResolver->createViewHelperInstance($namespaceIdentifier, $methodIdentifier);
-        // @todo: Is this call needed?
-        $viewHelper->prepareArguments();
         $viewHelperNode = $this->initializeViewHelperAndAddItToStack(
             $state,
             $namespaceIdentifier,