fix(zvm_vi_edit_command_line): Always use unaliased version of cat

[JxJxxJxJ]

Use the unaliased version of cat (always the 'cat' binary). Fixes instances where the user has a global alias to another program (i.e. 'bat').

Behavior fixed:

• Go into normal mode with [ESC]
• Press the keys [v v]
• <Enters the $VISUAL editor, in my case lvim with a temporary buffer>
• <Type something and :wq, saving and quitting the buffer>

And then:

On the terminal on top, I have BUFFER=$(cat $tmp_file), so it swaps cat for bat and outputs into the prompt the output of bat.

On the terminal on the bottom, I have BUFFER=$(\cat $tmp_file), so it always uses 'cat' despite my global alias to bat.