multiple: Fix abs(int) usage on float values

src/drivers/heater/heater.cpp

@@ -231,7 +231,7 @@ void Heater::Run()
 
 		_controller_time_on_usec = math::constrain(_controller_time_on_usec, 0, _controller_period_usec);
 
-		if (abs(temperature_delta) < TEMPERATURE_TARGET_THRESHOLD) {
+		if (fabsf(temperature_delta) < TEMPERATURE_TARGET_THRESHOLD) {
 			_temperature_target_met = true;
 
 		} else {

src/drivers/telemetry/hott/messages.cpp

@@ -249,7 +249,7 @@ build_gps_response(uint8_t *buffer, size_t *size)
 
 		if (lat < 0) {
 			msg.latitude_ns = 1;
-			lat = abs(lat);
+			lat = fabs(lat);
 		}
 
 		int deg;