AP_Scripting: copter deadreckoning lua check fixes

libraries/AP_Scripting/applets/copter-deadreckon-home.lua

@@ -55,8 +55,6 @@
 --   a. SIM_WIND_DIR <-- sets direction wind is coming from
 --   b. SIM_WIND_SPD <-- sets wind speed in m/s
 --
--- luacheck: only 0
-
 
 -- create and initialise parameters
 local PARAM_TABLE_KEY = 86  -- parameter table key must be used by only one script on a particular flight controller
@@ -194,7 +192,6 @@ local gps_or_ekf_bad = true         -- true if GPS and/or EKF is bad, true once
 local flight_stage = 0  -- 0. wait for good-gps and dist-from-home, 1=wait for bad gps or ekf, 2=level vehicle, 3=deadreckon home
 local gps_bad_start_time_ms = 0 -- system time GPS quality went bad (0 if not bad)
 local recovery_start_time_ms = 0-- system time GPS quality and EKF failsafe recovered (0 if not recovered)
-local fly_start_time_ms = 0     -- system time fly using deadreckoning started
 
 local home_dist = 0     -- distance to home in meters
 local home_yaw = 0      -- direction to home in degrees
@@ -224,7 +221,6 @@ function update()
   end
 
   -- check GPS
-  local gps_primary = gps:primary_sensor()
   local gps_speed_acc = gps:speed_accuracy(gps:primary_sensor())
   if gps_speed_acc == nil then
     gps_speed_acc = 99
@@ -251,7 +247,7 @@ function update()
 
   -- check EKF failsafe
   local fs_ekf = vehicle:has_ekf_failsafed()
-  if not (ekf_bad == fs_ekf) then
+  if ekf_bad ~= fs_ekf then
     ekf_bad = fs_ekf
   end
 
@@ -290,7 +286,6 @@ function update()
   -- reset flight_stage when disarmed
   if not arming:is_armed() then 
     flight_stage = 0
-    fly_start_time_ms = 0
     transition_start_time_ms = 0
     return update, interval_ms
   end