Default Heltec T114 to Fixed Pin

Heltec T114 has a no-screen option available for purchase. At
present the Bluetooth PIN on such a device is set to random, which
makes it challenging for users to connect.

We currently don't have code to detect (lack of) a SPI-based screen.
For now, set T114 to use a fixed pin, which users can later change.

Fixes meshtastic#4565

src/nimble/NimbleBluetooth.cpp

@@ -82,7 +82,8 @@ class NimbleBluetoothServerCallback : public NimBLEServerCallbacks
         LOG_INFO("*** Enter passkey %d on the peer side ***\n", passkey);
 
         powerFSM.trigger(EVENT_BLUETOOTH_PAIR);
-#if HAS_SCREEN
+// FIXME: T114 has a no-screen option and we have no logic for detecting (lack of) presence of SPI based screens #4565
+#if HAS_SCREEN && !defined(HELTEC_MESH_NODE_T114)
         screen->startAlert([passkey](OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y) -> void {
             char btPIN[16] = "888888";
             snprintf(btPIN, sizeof(btPIN), "%06u", passkey);
@@ -282,4 +283,4 @@ void clearNVS()
     ESP.restart();
 #endif
 }
-#endif
+#endif