fix: typo

Author: Balte de Wit

src/resolvers/upstreamKeyers/index.ts

@@ -73,7 +73,7 @@ export function resolveUpstreamKeyerMaskState (oldState: StateObject, newState:
 	let commands: Array<AtemCommands.AbstractCommand> = []
 
 	for (const mixEffectId in oldState.video.ME) {
-		if (newState.video.ME[mixEffectId]) continue
+		if (!newState.video.ME[mixEffectId]) continue
 		for (const upstreamKeyerId in oldState.video.ME[mixEffectId].upstreamKeyers) {
 			const oldKeyer = oldState.video.ME[mixEffectId].upstreamKeyers[upstreamKeyerId]
 			const newKeyer = newState.video.ME[mixEffectId].upstreamKeyers[upstreamKeyerId]