[fix] remove duplicate key in simple theme ESLint configuration

Partial merge of [PR-1736]

[PR-1736] https://github.com/searxng/searxng/pull/1736

Suggested-by: @FunctionalHacker in [1]
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/static/themes/simple/.eslintrc.json

@@ -18,7 +18,6 @@
         "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
         "curly": ["error", "multi-line"],
         "block-spacing": ["error", "always"],
-        "comma-spacing": ["error", { "before": false, "after": true }],
         "dot-location": ["error", "property"],
         "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
         "spaced-comment": ["error", "always", {