[Glitch] Rename JSX files with proper .jsx extension

Port 44a7d87cb1 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/components/drawer_loading.jsx

@@ -0,0 +1,11 @@
+import React from 'react';
+
+const DrawerLoading = () => (
+  <div className='drawer'>
+    <div className='drawer__pager'>
+      <div className='drawer__inner' />
+    </div>
+  </div>
+);
+
+export default DrawerLoading;