fix: change to correct comparison operator

[anoriqq]

Fixes a problem in which the following error message would appear each time a character was entered at the prompt

bash: ((: 1===1: syntax error: operand expected (error token is "=1")

commit 8bea90d to have a problem.

[akinomyoga]

Yeah, thanks. I actually received a report yesterday in another channel at #oil-help > zsh-like autocompletion @ 💬.

By the way, the fact that you see the error message implies that you use Bash < 4.0. I recommend the users switch to Bash >= 4.0 unless there is a specific reason. ble.sh has performance issues with Bash < 4.0. I'm sorry, please disregard this part. It just means you use Bash < 4.4 (but not necessarily Bash < 4.0). Sorry for the noise.

[akinomyoga]

Thanks! I've merged it.