instance segmentation: hovering over a segmentation shows the segmentation in the wrong position

**Describe the bug**

When hovering over a instance segmentation, the mask is shown in the wrong location on the image.


**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

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

**Screenshots**
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**Environment (please complete the following information):**
- OS: [e.g. iOS]
- Label Studio Version [e.g. 0.8.0]

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