Remove force option from 'Push Annotated Tag' permission

The force option on 'Push Annotated Tag' had no effect and is no longer
supported.
diff --git a/project.config b/project.config
index 73878ec..4b892f5 100644
--- a/project.config
+++ b/project.config
@@ -47,8 +47,8 @@
 	submit = group Administrators
 	submit = group Project Owners
 [access "refs/tags/*"]
-	pushTag = +force group Administrators
-	pushTag = +force group Project Owners
+	pushTag = group Administrators
+	pushTag = group Project Owners
 	pushSignedTag = group Administrators
 	pushSignedTag = group Project Owners
 	create = group Administrators
@@ -58,7 +58,7 @@
 	copyMinScore = true
 	value = -2 Do not submit
 	value = -1 I would prefer that you didn't submit this
-	value =  0 No score
+	value = 0 No score
 	value = +1 Looks good to me, but someone else must approve
 	value = +2 Looks good to me, approved
 	defaultValue = 0