Allow manual configuration of the editor settings file location

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This function:

emacs-gdscript-mode/gdscript-eglot.el

Line 45 in 5136be4

(defun gdscript-eglot--get-config-dir ()

hardcodes a few locations to find the godot settings file, with no way to overwrite it. For example, on Linux I use the "Godots" flatpak which doubles as a version manager for godot, and the editor settings file is at .var/app/io.github.MakovWait.Godots/config/godot/ rather than under ~/.config/godot.

Please allow a user to manually specify the location of this file. Right now for my use case a terrible workaround is to copy or symlink the file into ~/.config/godot for eglot LSP to work.