touch: native touch hooks to honor Invert Touch option (#588)

## Link to GitHub Issue or related Pull Request, if one exists
For #587 

## Description of change
`Invert Touch` option is now honored by the IIDX/SDVX touch handler.

src/spice2x/misc/nativetouchhook.cpp

@@ -92,6 +92,10 @@ namespace nativetouchhook {
             }
         }
 
+        if (rawinput::touch::INVERTED) {
+            flip_values = !flip_values;
+        }
+
         for (size_t i = 0; i < cInputs; i++) {
             PTOUCHINPUT point = &pInputs[i];