Icon placeholder during export/import an sj experiment file

**Describe the bug**
A clear and concise description of what the bug is.

When downloading an experiment from a device and then exporting that into another device the sensors icons are automatically replaced by the general icon.

**To Reproduce**
Steps to reproduce the behavior:
1. Download the experiment
2. Share it
3. Import the experiment from another device (Android iOS)
4. see the sensor cards recording values

**Expected behavior**
A clear and concise description of what you expected to happen.

The sensors should be imported with the relevant icon as it happens already with the data, and sensor label

**Screenshots**
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**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6] iOS, and Android
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Additional context**
Add any other context about the problem here.