refactor: use ale#Pad for option padding across the codebase (#5091)

Co-authored-by: PsickOSSH <PsickOSSH@protonmail.com>

autoload/ale/fixers/reorder_python_imports.vim

@@ -38,6 +38,6 @@ function! ale#fixers#reorder_python_imports#Fix(buffer) abort
 
     return {
     \   'command': ale#Escape(l:executable) . l:exec_args
-    \       . (!empty(l:options) ? ' ' . l:options : '') . ' -',
+    \       . ale#Pad(l:options) . ' -',
     \}
 endfunction