fix: execute autocmds correctly

[josa42]

Description

I tried to use the User TelescopeFindPre event listed on the README, but the autocmd was never executed. This PR fixes that.

Autocmds are currently executed like this:

vim.api.nvim_exec_autocmds("User TelescopeKeymap", {})

And to my knowledge the pattern needs to be passed as an option:

vim.api.nvim_exec_autocmds("User", { pattern = "TelescopeKeymap" })

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

1. Add a autocmd:
   autocmd User TelescopeFindPre echo "-> TelescopeFindPre!"
2. Open telescope

It should print "-> TelescopeFindPre!".

Configuration:

• Neovim version: v0.9.0-dev-912+gfe1e6b82f
• Operating system and version: macOS 13.1

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• [-] I have commented my code, particularly in hard-to-understand areas
• [-] I have made corresponding changes to the documentation (lua annotations)

[Conni2461]

thanks :)