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

* _

* format

* use define

firmware/application/apps/ble_tx_app.cpp

@@ -399,6 +399,7 @@ BLETxView::BLETxView(NavigationView& nav)
             nav,
             packetFileBuffer,
             64,
+            ENTER_KEYBOARD_MODE_ALPHA,
             [this](std::string& buffer) {
                 on_save_file(buffer);
             });