Add support for Julia environment inside a subdirectory

`lsp-mode` overrides default directory to be the project root
directory upon start so that a Julia environment residing in a
subdirectory won't be picked up. A better alternative could be just
start looking for an environment root starting from the current file
if available.

Author: vlaci

lsp-julia.el

@@ -252,8 +252,8 @@ body."
   "Get the (Julia) project root directory of the current file."
   (concat "\""
           (expand-file-name
-           (or (locate-dominating-file default-directory "Project.toml")
-               (locate-dominating-file default-directory "JuliaProject.toml")
+           (or (locate-dominating-file buffer-file-name "Project.toml")
+               (locate-dominating-file buffer-file-name "JuliaProject.toml")
                lsp-julia-default-environment))
           "\""))