Move JS into pre and post loading folders

gallery/static/js/post/login.js

@@ -54,7 +54,7 @@ function login(event) {
     }
 
     // Make form
-    let formData = new FormData();
+    const formData = new FormData();
     formData.append("username", formUsername);
     formData.append("password", formPassword);
 
@@ -153,7 +153,7 @@ function register(event) {
     }
 
     // Make form
-    let formData = new FormData();
+    const formData = new FormData();
     formData.append("username", formUsername);
     formData.append("email", formEmail);
     formData.append("password", formPassword);

gallery/static/js/post/uploadTab.js

@@ -167,7 +167,7 @@ function clearUpload() {
 // }
 
 
-document.addEventListener('DOMContentLoaded', function() {
+document.addEventListener('DOMContentLoaded', () => {
     // Function to upload images
     let uploadTab = document.querySelector(".upload-panel");