pointing_device: motion pin define and c-format weirdness (#22802)

the mutual exclusive POINTING_DEVICE_MOTION_PIN and SPLIT_POINTING_ENABLE influence if and how the `pointing_device_driver.get_report` is triggered. now the way the define is wrapping around an "unbraced" if leads clang-format to weirdly indent the first line in the 'SPLIT_POINTING_ENABLE' as the first command after the if.

this hints that any code addition in between the two - that possibly should run regardless, would break the if-def enabled code.

this can be solved by adding a pair of curly braces in the POINTING_DEVICE_MOTION_PIN part, to clearly denote which commands are to be skipped if the motion pin shows now activity.

Co-authored-by: Johannes <you@example.com>

quantum/pointing_device/pointing_device.c

@@ -251,14 +251,15 @@ __attribute__((weak)) bool pointing_device_task(void) {
 #    else
     if (readPin(POINTING_DEVICE_MOTION_PIN))
 #    endif
+    {
 #endif
 
 #if defined(SPLIT_POINTING_ENABLE)
 #    if defined(POINTING_DEVICE_COMBINED)
         static uint8_t old_buttons = 0;
-    local_mouse_report.buttons = old_buttons;
-    local_mouse_report         = pointing_device_driver.get_report(local_mouse_report);
-    old_buttons                = local_mouse_report.buttons;
+        local_mouse_report.buttons = old_buttons;
+        local_mouse_report         = pointing_device_driver.get_report(local_mouse_report);
+        old_buttons                = local_mouse_report.buttons;
 #    elif defined(POINTING_DEVICE_LEFT) || defined(POINTING_DEVICE_RIGHT)
         local_mouse_report = POINTING_DEVICE_THIS_SIDE ? pointing_device_driver.get_report(local_mouse_report) : shared_mouse_report;
 #    else
@@ -268,6 +269,10 @@ __attribute__((weak)) bool pointing_device_task(void) {
     local_mouse_report = pointing_device_driver.get_report(local_mouse_report);
 #endif // defined(SPLIT_POINTING_ENABLE)
 
+#ifdef POINTING_DEVICE_MOTION_PIN
+    }
+#endif
+
     // allow kb to intercept and modify report
 #if defined(SPLIT_POINTING_ENABLE) && defined(POINTING_DEVICE_COMBINED)
     if (is_keyboard_left()) {