index.js: include upcoming_version when adding snapshots

Order of operations was ignoring the upcoming version when adding
'*-SNAPSHOT' versions.  Make sure to put the upcoming version into
the versions list before we add snapshots.

Links: openwrt#7 (comment)
Signed-off-by: Eric Fahlgren <ericfahlgren@gmail.com>

www/index.js

@@ -837,14 +837,14 @@ async function init() {
           }) >= 0
       );
 
-      if (config.show_snapshots) {
-        insertSnapshotVersions(versions);
-      }
-
       if (config.upcoming_version != "") {
         versions.push(obj.upcoming_version);
       }
 
+      if (config.show_snapshots) {
+        insertSnapshotVersions(versions);
+      }
+
       return {
         versions: versions,
         image_url_override: obj.image_url_override,