Frontend: Fix makeArray function to work for non-strings

Signed-off-by: Fred Boniface <fred@fjla.uk>

static/js/lib.main.js

@@ -19,7 +19,7 @@ async function storageAvailable(type) {  // Currently not used
 /* Array Converter
    Converts a string to a single item array */
 async function makeArray(data) {
-    if (typeof data == "string") {
+    if (!Array.isArray(data)) {
         var array = [];
         array.push(data);
         return array;