Various Mirror Mode Fixes (#2149)

* Various Mirror Mode Fixes

* Avoid mutating mArrowPos2DX

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Co-authored-by: Luke Street <luke@street.dev>

src/dusk/touch_camera.cpp

@@ -7,6 +7,9 @@ float s_pitch_dp = 0.0f;
 }  // namespace
 
 void add_delta(float yaw_dp, float pitch_dp) noexcept {
+    if (getSettings().game.enableMirrorMode) {
+        yaw_dp *= -1.0;
+    }
     s_yaw_dp += yaw_dp;
     s_pitch_dp += pitch_dp;
 }