Fixed src/system/gps.c HasFix variable type from double to bool

Author: b00bl1k

src/system/gps.c

@@ -47,7 +47,7 @@ const int32_t MaxWestPosition = 8388608;        // -2^23
 
 NmeaGpsData_t NmeaGpsData;
 
-static double HasFix = false;
+static bool HasFix = false;
 static double Latitude = 0;
 static double Longitude = 0;