Update all Ruby linters to work consistently with bundler

autoload/ale/fixers/rubocop.vim

@@ -1,12 +1,9 @@
 function! ale#fixers#rubocop#GetCommand(buffer) abort
     let l:executable = ale#handlers#rubocop#GetExecutable(a:buffer)
-    let l:exec_args = l:executable =~? 'bundle$'
-    \   ? ' exec rubocop'
-    \   : ''
     let l:config = ale#path#FindNearestFile(a:buffer, '.rubocop.yml')
     let l:options = ale#Var(a:buffer, 'ruby_rubocop_options')
 
-    return ale#Escape(l:executable) . l:exec_args
+    return l:executable
     \   . (!empty(l:config) ? ' --config ' . ale#Escape(l:config) : '')
     \   . (!empty(l:options) ? ' ' . l:options : '')
     \   . ' --auto-correct %t'

autoload/ale/handlers/rubocop.vim

@@ -2,5 +2,7 @@ call ale#Set('ruby_rubocop_options', '')
 call ale#Set('ruby_rubocop_executable', 'rubocop')
 
 function! ale#handlers#rubocop#GetExecutable(buffer) abort
-    return ale#Var(a:buffer, 'ruby_rubocop_executable')
+    let l:executable = ale#Var(a:buffer, 'ruby_rubocop_executable')
+
+    return ale#handlers#ruby#EscapeExecutable(l:executable, 'rubocop')
 endfunction

autoload/ale/handlers/ruby.vim

@@ -37,3 +37,10 @@ function! ale#handlers#ruby#HandleSyntaxErrors(buffer, lines) abort
     return s:HandleSyntaxError(a:buffer, a:lines)
 endfunction
 
+function! ale#handlers#ruby#EscapeExecutable(executable, bundle_exec) abort
+    let l:exec_args = a:executable =~? 'bundle'
+    \   ? ' exec ' . a:bundle_exec
+    \   : ''
+
+    return ale#Escape(a:executable) . l:exec_args
+endfunction