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 4f000b3..75df270 100644
--- a/project.config
+++ b/project.config
@@ -51,7 +51,7 @@
 	submit = group Administrators
 	submit = group Project Owners
 [access "refs/tags/*"]
-	pushTag = +force group Administrators
+	pushTag = group Administrators
 	pushTag = group Project Owners
 	pushSignedTag = group Administrators
 	pushSignedTag = group Project Owners
@@ -62,7 +62,7 @@
 	copyAllScoresOnTrivialRebase = 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
@@ -70,7 +70,7 @@
 	function = MaxWithBlock
 	copyAllScoresIfNoCodeChange = true
 	value = -1 Fails
-	value =  0 No score
+	value = 0 No score
 	value = +1 Verified
 	defaultValue = 0
 [label "Code-Style"]