Squiz/FunctionDeclarationArgumentSpacing: exclude space from prepareForOutput()

The `SpacingAfterHint` error uses `Common::prepareForOutput()` to make
whitespace characters visible in the error message when the gap between
a type hint and argument contains tabs or newlines. Among other things,
the method replaces spaces with a UTF-8 middot character.

This commit changes the call to `Common::prepareForOutput()`, to pass
`[' ']` as the `$exclude` parameter so that spaces are displayed as-is
while tabs and newlines continue to be rendered as `\t` and `\n`. This
change is necessary because the middot character in the output can break
tools that pipe PHPCS output through non-UTF-8 environments (see
squizlabs/PHP_CodeSniffer 2652).

`Common::prepareForOutput()` was added to this sniff in PR 620.

Author: rodrigoprimo

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

@@ -280,7 +280,7 @@ public function processBracket(File $phpcsFile, int $openBracket)
                         $data[] = strlen($gap);
                     } else {
                         // Gap contains more than just spaces: render these for better clarity.
-                        $data[] = '"' . Common::prepareForOutput($gap) . '"';
+                        $data[] = '"' . Common::prepareForOutput($gap, [' ']) . '"';
                     }
 
                     $fix = $phpcsFile->addFixableError($error, $typeHintToken, 'SpacingAfterHint', $data);