Validate OTG keyboard and mouse not both disabled

Validate that at least one of keyboard and mouse are enabled in OTG mode
(otherwise there would be nothing to do).

app/src/cli.c

@@ -2603,6 +2603,12 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             LOGE("In OTG mode, --mouse only supports aoa or disabled.");
             return false;
         }
+
+        if (kmode == SC_KEYBOARD_INPUT_MODE_DISABLED
+                && mmode == SC_MOUSE_INPUT_MODE_DISABLED) {
+            LOGE("Could not disable both keyboard and mouse in OTG mode.");
+            return false;
+        }
     }
 
     if (opts->keyboard_input_mode != SC_KEYBOARD_INPUT_MODE_SDK) {

app/src/usb/scrcpy_otg.c

@@ -127,12 +127,6 @@ scrcpy_otg(struct scrcpy_options *options) {
     bool enable_mouse =
         options->mouse_input_mode == SC_MOUSE_INPUT_MODE_AOA;
 
-    // If neither --hid-keyboard or --hid-mouse is passed, enable both
-    if (!enable_keyboard && !enable_mouse) {
-        enable_keyboard = true;
-        enable_mouse = true;
-    }
-
     if (enable_keyboard) {
         ok = sc_keyboard_aoa_init(&s->keyboard, &s->aoa);
         if (!ok) {