Fix #9334: belt funnel not blocking items when inserting to a full vault

[Apertyotis]

fix #7400
fix #9334 (duplicate issue)

Bug Description

Belt funnels facing against belt movement fail to block items when the target vault is already full.

• Affected versions: 0.5.1f and later
• Trigger condition: When a belt funnel attempts to insert to a full vault

Fix

When the vault is full, stillWaiting() returns true, indicating that items cannot be inserted. In this case, blocking should be checked, and checkForFunnels() should return true when blocked, indicating that the item is obstructed.

if (beltInventory.belt.invVersionTracker.stillWaiting(inserting))
	if (blocking)
		return true;
	else
		continue;

[Apertyotis]

fix #9334, though it is still unclear why RPM affects this issue.