Changed error message to be consistent with others (ref #2582)

Author: gsherwood

src/Standards/Generic/Sniffs/Files/FilePermissionsSniff.php

@@ -43,9 +43,8 @@ public function process(File $phpcsFile, $stackPtr)
 
         if ($filename !== 'STDIN') {
             $perms = fileperms($phpcsFile->getFilename());
-
             if (($perms & 0x0040) !== 0 || ($perms & 0x0008) !== 0 || ($perms & 0x0001) !== 0) {
-                $error = "A PHP file should not be executable. Found file permission set to %s.";
+                $error = 'A PHP file should not be executable; found file permissions set to %s';
                 $data  = [substr(sprintf('%o', $perms), -4)];
                 $phpcsFile->addError($error, 0, 'Executable', $data);
             }