tools: simplify ESLint invocation in Makefile

Makefile currently enforces .eslintrc.js linting on the command line but
it is already enforced in the .estlintignore file.

This also simplifies an arguably-related comment in .estlinrc.js.

.eslintrc.js

@@ -187,7 +187,7 @@ module.exports = {
         message: 'Use new keyword when throwing an Error.',
       }
     ],
-    /* eslint-enable max-len, quotes */
+    /* eslint-enable max-len */
     'no-return-await': 'error',
     'no-self-assign': 'error',
     'no-self-compare': 'error',

Makefile

@@ -1120,7 +1120,7 @@ endif
 LINT_JS_TARGETS = .eslintrc.js benchmark doc lib test tools
 
 run-lint-js = tools/node_modules/eslint/bin/eslint.js --cache \
-	--ext=.js,.mjs,.md $(LINT_JS_TARGETS) --ignore-pattern '!.eslintrc.js'
+	--ext=.js,.mjs,.md $(LINT_JS_TARGETS)
 run-lint-js-fix = $(run-lint-js) --fix
 
 .PHONY: lint-js-fix