Universal/PrecisionAlignment: set redundant default values

These variables are only accessed within conditions and those conditions already sufficiently ensure that the variables will be set for the conditions path.

Even so, PHPStan cannot handle this, so we may as well declare sensible defaults for each of those variables to make things more explicit.

Universal/Sniffs/WhiteSpace/PrecisionAlignmentSniff.php

@@ -208,7 +208,11 @@ public function process(File $phpcsFile, $stackPtr)
                 $origContent = $tokens[$i]['orig_content'];
             }
 
-            $spaces = 0;
+            $spaces  = 0;
+            $length  = 0;
+            $content = '';
+            $closer  = '';
+
             switch ($tokens[$i]['code']) {
                 case \T_WHITESPACE:
                     if ($this->ignoreBlankLines === true