Revert "init: change --manifest-depth default to 1"

This reverts commit 622a5bf9c2.

CrOS infra is failing to sync code now for some reason.
Until we can investigate further, pull this back out.

Bug: 475668525
Bug: 468033850
Change-Id: I35a8623a95336df1be27ea870afbfc8065609f01
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/545141
Reviewed-by: Gavin Mak <gavinmak@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>

repo

@@ -129,7 +129,7 @@ if not REPO_REV:
 BUG_URL = "https://issues.gerritcodereview.com/issues/new?component=1370071"
 
 # increment this whenever we make important changes to this script
-VERSION = (2, 61)
+VERSION = (2, 54)
 
 # increment this if the MAINTAINER_KEYS block is modified
 KEYRING_VERSION = (2, 3)
@@ -325,7 +325,7 @@ def InitParser(parser):
     group.add_option(
         "--manifest-depth",
         type="int",
-        default=1,
+        default=0,
         metavar="DEPTH",
         help="create a shallow clone of the manifest repo with "
         "given depth (0 for full clone); see git clone "