fix typo error on config directive of EditorConfig Checker

Author: llaville

.github/linters/.editorconfig-checker.json

@@ -2,7 +2,7 @@
     "Verbose": false,
     "Debug": false,
     "IgnoreDefaults": false,
-    "SpacesAftertabs": false,
+    "SpacesAfterTabs": false,
     "NoColor": false,
     "Exclude": ["\\.editorconfig", "\\.github", "\\.gitignore", "LICENSE", "^README\\.md", "vendor", "\\.phplint-cache", "\\.changes"],
     "AllowedContentTypes": [],