[OpenXR] Escape key now works even with unworn headset.

When the escape key is pressed, immediately close the session when
the session is stopped.

src/HardwareSet/OpenXRSet/OpenXRSet.cpp

@@ -1164,13 +1164,18 @@ void OpenXRSet::keyCallback(GLFWwindow* window, int key, int scancode, int actio
 {
 	bool eaten { false };
 
-	if (action == GLFW_PRESS && key == GLFW_KEY_ESCAPE) {
-		xrRequestExitSession(oxrConn.session);
-		return;
-	}
-
 	if (action == GLFW_PRESS) {
 		switch (key) {
+			case GLFW_KEY_ESCAPE:
+				{
+					auto result = xrRequestExitSession(oxrConn.session);
+					if (result == XR_ERROR_SESSION_NOT_RUNNING) {
+						// immediate close
+						close();
+					}
+					eaten = true;
+				}
+				break;
 			case GLFW_KEY_S:
 				takeScreenshot("test");
 				eaten = true;