Squiz/FunctionDeclarationArgumentSpacing: minor simplification

No need to recreate the type hint when it's already available in the return value of the `getMethodParameters()` method.

Author: jrfnl

src/Standards/Squiz/Sniffs/Functions/FunctionDeclarationArgumentSpacingSniff.php

@@ -396,10 +396,7 @@ public function processBracket($phpcsFile, $openBracket)
                             }
                         }//end if
                     } else {
-                        $hint = $phpcsFile->getTokensAsString($param['type_hint_token'], (($param['type_hint_end_token'] - $param['type_hint_token']) + 1));
-                        if ($param['nullable_type'] === true) {
-                            $hint = '?'.$hint;
-                        }
+                        $hint = $param['type_hint'];
 
                         if ($tokens[($commaToken + 1)]['code'] !== T_WHITESPACE) {
                             $error = 'Expected 1 space between comma and type hint "%s"; 0 found';