Remove BATTERY_PIN from tlora v1 target (#996)

src/configuration.h

@@ -330,8 +330,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define GPS_RX_PIN 36
 #define GPS_TX_PIN 37
 
-#define BATTERY_PIN 35 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage
-
 #define I2C_SDA 4 // I2C pins for this board
 #define I2C_SCL 15