driver::hid: Remove Mouse::getReport()

This function is completely unused, and should not have been exposed to begin
with. Neither in the base class, nor in specific implementations.

The `getReport()` method ties us to a specific report datatype, both in name,
and in shape. That's not something we want, we'd rather have the base class be
HID-library agnostic, which it can't be with `getReport()` present.

Luckily, the function is completely unused, and as such, is safe to remove
without deprecation.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/driver/hid/base/Mouse.h

@@ -35,10 +35,6 @@ class NoMouse {
   void press(uint8_t buttons) {}
   void release(uint8_t buttons) {}
   void click(uint8_t buttons) {}
-  HID_MouseReport_Data_t getReport() {
-    static HID_MouseReport_Data_t report;
-    return report;
-  }
 };
 
 struct MouseProps {

src/kaleidoscope/driver/hid/keyboardio/Mouse.h

@@ -76,9 +76,6 @@ class MouseWrapper {
   void click(uint8_t buttons) {
     Mouse.click(buttons);
   }
-  HID_MouseReport_Data_t getReport() {
-    return Mouse.getReport();
-  }
 };
 
 struct MouseProps: public base::MouseProps {