Fix spectating when clicking with unlocked cursor (fixes #224)

> If you misclick the add keyframe button or something, you end up specating
instead and you have to find the camera angle again

src/main/java/com/replaymod/replay/camera/CameraEntity.java

@@ -574,7 +574,7 @@ public class CameraEntity
 
     private void handleInputEvents() {
         if (this.client.options.keyAttack.wasPressed() || this.client.options.keyUse.wasPressed()) {
-            if (canSpectate(this.client.targetedEntity)) {
+            if (this.client.currentScreen == null && canSpectate(this.client.targetedEntity)) {
                 ReplayModReplay.instance.getReplayHandler().spectateEntity(
                         //#if MC<=10710
                         //$$ (EntityLivingBase)