Remove the redundant fix_buffer_data vars and filename variables

autoload/ale.vim

@@ -192,12 +192,7 @@ endfunction
 " Every variable name will be prefixed with 'ale_'.
 function! ale#Var(buffer, variable_name) abort
     let l:full_name = 'ale_' . a:variable_name
-    let l:vars = getbufvar(str2nr(a:buffer), '', 0)
-
-    if l:vars is 0
-        " Look for variables from deleted buffers, saved from :ALEFix
-        let l:vars = get(get(g:ale_fix_buffer_data, a:buffer, {}), 'vars', {})
-    endif
+    let l:vars = getbufvar(str2nr(a:buffer), '', {})
 
     return get(l:vars, l:full_name, g:[l:full_name])
 endfunction

autoload/ale/fix.vim

@@ -420,9 +420,7 @@ function! ale#fix#InitBufferData(buffer, fixing_flag) abort
     " The 'done' flag tells the function for applying changes when fixing
     " is complete.
     let g:ale_fix_buffer_data[a:buffer] = {
-    \   'vars': getbufvar(a:buffer, ''),
     \   'lines_before': getbufline(a:buffer, 1, '$'),
-    \   'filename': expand('#' . a:buffer . ':p'),
     \   'done': 0,
     \   'should_save': a:fixing_flag is# 'save_file',
     \   'temporary_directory_list': [],