Fix ftdetect interfering with other plugins (#1183)

This is from the help doc :help ftdetect:

Note that there is no "augroup" command, this has already been done
when sourcing your file.  You could also use the pattern "*" and then
check the contents of the file to recognize it.

Reference:
Vimjas/vint#264
fatih/vim-go#1645

ftdetect/javascript.vim

@@ -4,8 +4,5 @@ fun! s:SelectJavascript()
   endif
 endfun
 
-augroup javascript_syntax_detection
-  autocmd!
-  autocmd BufNewFile,BufRead *.{js,mjs,jsm,es,es6},Jakefile setfiletype javascript
-  autocmd BufNewFile,BufRead * call s:SelectJavascript()
-augroup END
+autocmd BufNewFile,BufRead *.{js,mjs,jsm,es,es6},Jakefile setfiletype javascript
+autocmd BufNewFile,BufRead * call s:SelectJavascript()