fix: set correct PATH for fish shell

[pothi]

Direct quote from https://fishshell.com/docs/current/index.html#configuration ...

.fish scripts in ~/.config/fish/conf.d/ are also automatically executed before config.fish.

brew initializes itself via config.fish file. So, the PATH doesn't have /opt/homebrew/bin when ~/.config/fish/conf.d/fnm.fish is executed, resulting in the following error...

fish: Unknown command: fnm
~/.config/fish/conf.d/fnm.fish (line 5): 
  fnm env | source
  ^~^
from sourcing file ~/.config/fish/conf.d/fnm.fish
	called on line 253 of file /usr/local/share/fish/config.fish
from sourcing file /usr/local/share/fish/config.fish
	called during startup
Welcome to fish, the friendly interactive shell
Type help for instructions on how to use fish

This pull request sets correct PATH to initialize fnm on fish shell.

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Latest commit: 7dd8528

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Name	Status	Preview	Comments	Updated (UTC)
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