erp5_officejs_drone_simulator: fix altitude related functions

- fix setAltitude:
  - Update `_last_target` when calling `setAltitude` otherwise `loiter` is broken.
  - Convert altitude parameter from absolute to relative value.

- fix getInitialAltitude
  - return absolute altitude

- fix getAltitudeAbs

bt5/erp5_officejs_drone_simulator/PathTemplateItem/web_page_module/drone_simulator_fixedwingdrone_js.js

@@ -262,7 +262,8 @@ var FixedWingDroneAPI = /** @class */ (function () {
   };
 
   FixedWingDroneAPI.prototype.setAltitude = function (drone, altitude) {
-    drone._targetCoordinates.z = altitude;
+    drone._targetCoordinates.z = altitude - this._map_dict.start_AMSL;
+    this._last_target = drone._targetCoordinates;
   };
 
   FixedWingDroneAPI.prototype.setSpeed = function (drone, speed) {
@@ -526,10 +527,10 @@ var FixedWingDroneAPI = /** @class */ (function () {
     return;
   };
   FixedWingDroneAPI.prototype.getInitialAltitude = function () {
-    return 0;
+    return this._map_dict.start_AMSL;
   };
   FixedWingDroneAPI.prototype.getAltitudeAbs = function (altitude) {
-    return altitude;
+    return altitude + this._map_dict.start_AMSL;
   };
   FixedWingDroneAPI.prototype.getMinHeight = function () {
     return 0;

bt5/erp5_officejs_drone_simulator/PathTemplateItem/web_page_module/drone_simulator_fixedwingdrone_js.xml

@@ -240,7 +240,7 @@
                   </item>
                   <item>
                       <key> <string>serial</string> </key>
-                      <value> <string>1006.36731.10993.50739</string> </value>
+                      <value> <string>1007.12617.23470.24132</string> </value>
                   </item>
                   <item>
                       <key> <string>state</string> </key>
@@ -260,7 +260,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1677169724.0</float>
+                              <float>1679396042.23</float>
                               <string>UTC</string>
                             </tuple>
                           </state>