UPBGE: Fix keyboard sensor without qualifiers.

Previously the qualifiers was taken in count event if they was unused.
It create the sensor to be always true as the default status of qualifier is
to true in the Evaluate function.

To fix this issue the logic was inverted : the default value is to false and
test on these values are done only if m_qual and m_qual2 are valid.

source/gameengine/GameLogic/SCA_KeyboardSensor.cpp

@@ -133,7 +133,7 @@ bool SCA_KeyboardSensor::Evaluate()
 {
 	bool result    = false;
 	bool reset     = m_reset && m_level;
-	bool qual[2] = {true, true};
+	bool qual[2] = {false, false};
 
 	SCA_IInputDevice* inputdev = ((SCA_KeyboardManager *)m_eventmgr)->GetInputDevice();
 	//  	cerr << "SCA_KeyboardSensor::Eval event, sensing for "<< m_hotkey << " at device " << inputdev << "\n";
@@ -190,15 +190,15 @@ bool SCA_KeyboardSensor::Evaluate()
 		 */
 		if (m_qual > 0) {
 			const SCA_InputEvent & qualevent = inputdev->GetInput((SCA_IInputDevice::SCA_EnumInputs) m_qual);
-			if (!qualevent.Find(SCA_InputEvent::ACTIVE)) {
-				qual[0] = false;
+			if (qualevent.Find(SCA_InputEvent::ACTIVE)) {
+				qual[0] = true;
 			}
 		}
 		if (m_qual2 > 0) {
 			const SCA_InputEvent & qualevent = inputdev->GetInput((SCA_IInputDevice::SCA_EnumInputs) m_qual2);
 			/* copy of above */
-			if (!qualevent.Find(SCA_InputEvent::ACTIVE)) {
-				qual[1] = false;
+			if (qualevent.Find(SCA_InputEvent::ACTIVE)) {
+				qual[1] = true;
 			}
 		}
 		/* done reading qualifiers */
@@ -229,7 +229,7 @@ bool SCA_KeyboardSensor::Evaluate()
 		m_status[1] = qual[0];
 		m_status[2] = qual[1];
 
-		if (!qual[0] || !qual[1]) { /* one of the qualifiers are not pressed */
+		if ((m_qual > 0 && !qual[0]) || (m_qual2 > 0 && !qual[1])) { /* one of the used qualifiers are not pressed */
 			m_val = 0; /* since one of the qualifiers is not on, set the state to false */
 		}
 		/* done with key quals */