fix: revert swapped GPS pins

reverted GPS pin behaviour and swapped GPS pins for tbeam variants.

variants/lilygo_tbeam_SX1262/platformio.ini

@@ -16,8 +16,8 @@ build_flags =
   -D P_LORA_TX_LED=4
   -D PIN_BOARD_SDA=21
   -D PIN_BOARD_SCL=22
-  -D PIN_GPS_RX=34
-  -D PIN_GPS_TX=12
+  -D PIN_GPS_RX=12
+  -D PIN_GPS_TX=34
   -D PIN_USER_BTN=38
   -D ENV_INCLUDE_GPS=1
 build_src_filter = ${esp32_base.build_src_filter}