feat(loader): handle hyphens in file names when deactivating

## Description

When deactivating plugins `vim.g.loaded_` variables are cleared based on
a common pattern plugins use to use avoid multiple initializing. The
current logic handles most cases, except when a lua file has a hyphen in
which case it is unlikely to clear the correct variable.

lua/lazy/core/loader.lua

@@ -238,7 +238,7 @@ function M.deactivate(plugin)
   -- clear vim.g.loaded_ for plugins
   Util.ls(plugin.dir .. "/plugin", function(_, name, type)
     if type == "file" then
-      vim.g["loaded_" .. name:gsub("%..*", "")] = nil
+      vim.g["loaded_" .. name:gsub("%..*", ""):gsub("-", "_")] = nil
     end
   end)
   -- set as not loaded