Revert "[update] Exit with 0 when there are uncommited changes."

This reverts commit 60436c301224231cb99be41ce937dfc223bee272.

Reason for revert: Infra change in fxr/395436

Original change's description:
> [update] Exit with 0 when there are uncommited changes.
> 
> Before this change, Jiri will return 0 when there are uncommit changes
> but if the the local repo is up to date with remote and return 1 if
> the local repo is not up to date. After this change, in both cases,
> Jiri will return 0.
> 
> Bug: 42984
> Change-Id: I76e18913228c5b1e8199d73bb26a812f9624bbcf

TBR=phosek@google.com,haowei@google.com,dhobsd@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 42984
Change-Id: Ib6fc625008f61b53fd4d03931c31b958b757ce93
Reviewed-on: https://fuchsia-review.googlesource.com/c/jiri/+/395733
Reviewed-by: Haowei Wu <haowei@google.com>
Commit-Queue: Haowei Wu <haowei@google.com>
diff --git a/project/project.go b/project/project.go
index 4462354..a4c2c61 100644
--- a/project/project.go
+++ b/project/project.go
@@ -1801,7 +1801,7 @@
 		}
 		msg += fmt.Sprintf("\nCommit or discard the changes and try again.\n\n")
 		jirix.Logger.Errorf(msg)
-		// Do not call jirix.IncrementFailures() here. See fxb/42984.
+		jirix.IncrementFailures()
 		return nil
 	}