bug: `LaunchOrFocusPlugin` creates new plugin instances when using plugin aliases

[cristiand391]

2. Issues with the Zellij UI / behavior / crash

Issue description

both the CLI action launch-or-focus-plugin and keybind action LaunchOrFocusPlugin create a new plugin instance instead of focusing on the existing one when using plugin aliases.

Workaround: use file schema URL

Minimal reproduction

1. download zj-quit and set up an alias for it:

   plugins {
   zj-quit location="file:/path/to/zj-quit.wasm"
   }

2. start zellij and launch it from the CLI with the launch-or-focus-plugin action using the plugin alias:

   zellij action launch-or-focus-plugin --floating zj-quit

press Esc to make it hide itself: https://github.com/cristiand391/zj-quit/blob/1ab13ff06af29215bba33ed03b116ef407acc8c1/src/main.rs#L40

repeat that 3 times and then open the session-manager and check the panes in the current tab, you should see this:

note that there's 3 zj-quit panes instead of just 1.

now repeat step 2 but use the file schema URL:

zellij action launch-or-focus-plugin --floating "file:/path/to/zj-quit.wasm"

check the session-manager again, only 1 zj-quit instance is open.

Other relevant information

I noticed this first when using the keybind action, doesn't seem to affect the zellij: schema.

zellij --version: zellij 0.40.1