make the ptext_prompt func can define which keyboard to enter (#2608)

* _

* format

* use define

firmware/application/external/adsbtx/ui_adsb_tx.cpp

@@ -131,6 +131,7 @@ ADSBCallsignView::ADSBCallsignView(
             nav,
             callsign,
             8,
+            ENTER_KEYBOARD_MODE_ALPHA,
             [this](std::string& s) {
                 button_callsign.set_text(s);
             });