project.config: rename submit requirement Hold to No-Holds

A bit less confusing in the UI to see a checkmark next to No-Holds.

project.config

diff --git a/project.config b/project.config
index 3fdab2b..6174dfd 100644
--- a/project.config
+++ b/project.config
@@ -146,6 +146,6 @@
 	description = At least one Code-Review+2 is required. Self review is not allowed.
 	submittableIf = label:Code-Review=MAX,user=non_uploader
 	canOverrideInChildProjects = true
-[submit-requirement "Hold"]
+[submit-requirement "No-Holds"]
 	description = Changes with a Hold+1 vote are not submittable.
 	submittableIf = NOT label:Hold=1