cooldown: allow gcd disabled timers to reset duration

modules/cooldown.lua

@@ -104,12 +104,12 @@ pfUI:RegisterModule("cooldown", "vanilla:tbc", function ()
 
     -- don't draw global cooldowns
     if this.pfCooldownType == "NOGCD" and duration < tonumber(C.appearance.cd.threshold) then
-      return
+      start, duration = 0, 0
     end
 
     -- disable GCDs on non pfUI frames
     if not this.pfCooldownType and duration < tonumber(C.appearance.cd.threshold) then
-      return
+      start, duration = 0, 0
     end
 
     -- hide animation