Clear fade-out on request fireing in AnimationNodeOneShot

(cherry picked from commit 7b80ae73255435e48c7b217046292e51992cbf23)

scene/animation/animation_blend_tree.cpp

@@ -644,6 +644,9 @@ AnimationNode::NodeTimeInfo AnimationNodeOneShot::_process(const AnimationMixer:
 		set_parameter(request, ONE_SHOT_REQUEST_NONE);
 		set_parameter(internal_active, true);
 		set_parameter(active, true);
+		// Clear fade-out.
+		is_fading_out = false;
+		cur_fade_out_remaining = 0;
 	}
 
 	real_t blend = 1.0;