chore: removed unused vars from test

Author: mhanberg

tests/compile_spec.lua

@@ -1,13 +1,7 @@
 local eq = assert.are.same
-local shell = vim.fn.system
 local Path = require("plenary.path")
 local Compile = require("elixir.language_server.compile")
 
-local p = function(x)
-	io.stdout:write(vim.inspect(x) .. "\n")
-	return x
-end
-
 local versions = require("elixir.language_server.version").get()
 
 describe("compile", function()