patch 8.0.1465: python2 and python3 detection not tested

Problem:    Python2 and python3 detection not tested. (Matej Cepl)
Solution:   Add test for detecting python2 and python3.  Also detect a script
            using "js" as javascript.
diff --git a/runtime/scripts.vim b/runtime/scripts.vim
index fe05d26..e271db8 100644
--- a/runtime/scripts.vim
+++ b/runtime/scripts.vim
@@ -137,7 +137,7 @@
     set ft=ruby
 
     " JavaScript
-  elseif s:name =~# 'node\(js\)\=\>' || s:name =~# 'rhino\>'
+  elseif s:name =~# 'node\(js\)\=\>\|js\>' || s:name =~# 'rhino\>'
     set ft=javascript
 
     " BC calculator