Remove useless Dir.chdir in Terraform::Runner

Dir.glob returns full file pathnames that have the dir_path stipped
before adding to the zipfile anyway so the Dir.chdir is entirely useless
here.

lib/terraform/runner.rb

@@ -170,8 +170,7 @@ def encoded_zip_from_directory(template_path)
         Tempfile.create(%w[opentofu-runner-payload .zip]) do |zip_file_path|
           _log.debug("Create #{zip_file_path}")
           Zip::File.open(zip_file_path, Zip::File::CREATE) do |zipfile|
-            Dir.chdir(dir_path)
-            Dir.glob("**/*").select { |fn| File.file?(fn) }.each do |file|
+            Dir.glob(File.join(dir_path, "/**/*")).select { |fn| File.file?(fn) }.each do |file|
               _log.debug("Adding #{file}")
               zipfile.add(file.sub("#{dir_path}/", ''), file)
             end