Fix OCIOLutNode direction changes being ignored

EnsureProcessor() was returning early whenever a processor existed and
processor_dirty_ was false, without checking whether the file or direction
input had changed. As a result, switching Forward/Inverse in the main GUI
re-used the old processor and produced no visible difference.

Now EnsureProcessor() also compares the current inputs against the values
used to create last_processor_, so direction/file changes always trigger a
regeneration before the color transform job is emitted.

app/node/color/ociolut/ociolut.cpp

@@ -160,7 +160,9 @@ void OCIOLutNode::EnsureProcessor() const
 {
 	QMutexLocker locker(&gen_mutex_);
 
-	if (!processor_dirty_ && last_processor_) {
+	if (!processor_dirty_ && last_processor_ &&
+		GetStandardValue(kFileInput).toString() == last_path_ &&
+		GetStandardValue(kDirectionInput).toInt() == last_direction_) {
 		return;
 	}