Ensure git gem messages always appear

When there is no lockfile, we've already cloned the repository earlier to resolve the lockfile. So the check here will return false and some git gems message will not appear.

lib/gel/lock_loader.rb

@@ -98,7 +98,7 @@ def activate(env, base_store, install: false, output: nil)
             revision = resolved_gem.body["revision"].first
 
             dir = git_depot.git_path(remote, revision)
-            if installer && !Dir.exist?(dir)
+            if installer
               installer.load_git_gem(remote, revision, name)
 
               locks[name] = -> { Gel::DirectGem.new(dir, name, resolved_gem.version) }