Rename tests to use the “.jsx” file extension

* test/manual/indent/js-jsx-quote.js: Renamed to “jsx-quote.jsx”.
* test/manual/indent/js-jsx-unclosed-1.js: Renamed to
“jsx-unclosed-1.jsx”.
* test/manual/indent/js-jsx-unclosed-2.js: Renamed to
“jsx-unclosed-2.jsx”.
* test/manual/indent/js-jsx.js: Renamed to “jsx.jsx”.

* test/manual/indent/jsx-quote.jsx: Renamed from “js-jsx-quote.js”.
* test/manual/indent/jsx-unclosed-1.jsx: Renamed from
“js-jsx-unclosed-1.js”.
* test/manual/indent/jsx-unclosed-2.jsx: Renamed from
“js-jsx-unclosed-2.js”.
* test/manual/indent/jsx.jsx: Renamed from “js-jsx.js”.

test/manual/indent/jsx-quote.jsx

@@ -1,5 +1,3 @@
-// -*- mode: js-jsx; -*-
-
 // JSX text node values should be strings, but only JS string syntax
 // is considered, so quote marks delimit strings like normal, with
 // disastrous results (https://github.com/mooz/js2-mode/issues/409).

test/manual/indent/jsx-unclosed-1.jsx

@@ -1,5 +1,3 @@
-// -*- mode: js-jsx; -*-
-
 // Local Variables:
 // indent-tabs-mode: nil
 // js-indent-level: 2

test/manual/indent/jsx-unclosed-2.jsx

@@ -1,5 +1,3 @@
-// -*- mode: js-jsx; -*-
-
 // Local Variables:
 // indent-tabs-mode: nil
 // js-indent-level: 2

test/manual/indent/jsx.jsx

@@ -1,5 +1,3 @@
-// -*- mode: js-jsx; -*-
-
 var foo = <div></div>;
 
 return (