Popup: Fix z-index in any case

[louismaximepiton]

Description

There are two solutions to answer the #34 issue:

1. The first one is to remove

   IOT-Map-Component/src/iotMapManager/src/iot-map-marker.ts

   Line 53 in a2d92f1

   this.setZIndexOffset((selected) ? 100 : 0)

   
   This way seems more logical, but the following could happen:
   

2. The second one is to increase the zindexOffset of the same line to 1000000 as what was done inside the PR to avoid the case illustrated above.
   This looks to be mandatory because of this line on Markercluster side:
   https://github.com/Leaflet/Leaflet.markercluster/blob/bd2794c35831612a86f63766c26d94f809de7abc/src/MarkerCluster.Spiderfier.js#L237

Maybe we can handle this in a different way but this seemed the more logical to me right now

How to test

Change id: 's2' to get the following:

location: {
  lat: 44.892,
  lng: 4.872
},

Related issues

Fixes #34.

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