Ignore the first hover event with a stale position on iOS

Fixes https://github.com/libsdl-org/SDL/issues/15450

(cherry picked from commit 3c02de2f7cd4c42eaa71f9a0ad9e7d9dfa26b000)

src/video/uikit/SDL_uikitpen.m

@@ -124,6 +124,11 @@ static void UIKit_HandlePenAxes(SDL_Window *window, NSTimeInterval nstimestamp,
         // rotation is in radians, and only available on a later iOS.
         const float rotation = rollAngle * radians_to_degrees;  // !!! FIXME: this might need adjustment, I don't have a pencil that supports it.
 
+        if (force == 0.0f && (SDL_GetPenStatus(penId, NULL, 0) & SDL_PEN_INPUT_DOWN)) {
+            // The first hover as the pen is being released has a stale position, so ignore it
+            return;
+        }
+
         SDL_SendPenMotion(timestamp, penId, window, point->x, point->y);
         SDL_SendPenAxis(timestamp, penId, window, SDL_PEN_AXIS_PRESSURE, pressure);
         SDL_SendPenAxis(timestamp, penId, window, SDL_PEN_AXIS_XTILT, xtilt);