Revert "Fix problem of RepackApexPayload when using option --signing_args"

This reverts commit 5ebc4febe6f1f0b926470bed700183f2da731996.

Reason for revert: This is causing the signing args to be improperly passed to apexer, treating them as if they are not specified as all.

Change-Id: Ifa0f8444a4a1871802316511b0ff0735f3350b2c
Bug: 361784913
diff --git a/tools/releasetools/apex_utils.py b/tools/releasetools/apex_utils.py
index 1b0b89a..3abef3b 100644
--- a/tools/releasetools/apex_utils.py
+++ b/tools/releasetools/apex_utils.py
@@ -198,7 +198,7 @@
     # --signing_args "--signing_helper_with_files=%path" to apexer
     if signing_args:
       generate_image_cmd.extend(
-          ['--signing_args', signing_args])
+          ['--signing_args', '"{}"'.format(signing_args)])
 
     # optional arguments for apex repacking
     manifest_json = os.path.join(apex_dir, 'apex_manifest.json')