Fix wrong X scroll delta

Closes #102

Signed-off-by: falkTX <falktx@falktx.com>

src/CardinalUI.cpp

@@ -603,7 +603,7 @@ protected:
 
     bool onScroll(const ScrollEvent& ev) override
     {
-        rack::math::Vec scrollDelta = rack::math::Vec(-ev.delta.getX(), ev.delta.getY());
+        rack::math::Vec scrollDelta = rack::math::Vec(ev.delta.getX(), ev.delta.getY());
 #ifdef DISTRHO_OS_MAC
         scrollDelta = scrollDelta.mult(10.0);
 #else