rawinput: fix signed range values (#653)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
Official GuitarFreaks controller has the motion sensor values with
`valuemin=-127` to `valuemax=127` and we don't deal with negative values
correctly.

## Testing
tbd

src/spice2x/rawinput/touch.cpp

@@ -99,7 +99,7 @@ namespace rawinput::touch {
 
         // check type
         if (device->type != HID) {
-            log_fatal("rawinput", "touch update called on non HID device");
+            log_warning("rawinput", "touch update called on non HID device");
             return;
         }