Fix compatability with fish vi key bindings (#541)

PR #420 addressed the existence of pagination in a fish prompt by trying
to track when pagination was enabled and disabled. This introduced
atuin-specific bindings for common keys: `\t`, `\e`, `\r`, and `\n`
which exports a variable and informs the `_autiun_search` function to
not show the TUI.

Fish has a commandline function that will instead tell you whether
pagination is enabled so the user doesn't need to keep track of that
state. This PR uses this function, `commandline -P` to replace the prior
TUI supression scheme. Removing these extra function calls allows us to
remove the additional bindings which were breaking fish vi key bindings.

Replacing the value for `bind -M insert \e` completely breaks vi mode by
blocking the user from exiting insert mode. By removing these extra
binds, this PR restores fish vi mode compatability.

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