Don't set widget values in the widgets (as done from file)

[paddyroddy]

Fixes #377

[deprecated-napari-hub-preview-bot[bot]]

Preview page for your plugin is ready here: https://preview.napari-hub.org/quantumjot/btrack/379 Updated: 2023-08-07T16:09:25.976342

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% :warning:

Comparison is base (009622b) 85.91% compared to head (616287d) 85.89%. Report is 2 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #379 +/- ## ========================================== - Coverage 85.91% 85.89% -0.02% ========================================== Files 30 30 Lines 2172 2148 -24 Branches 396 393 -3 ========================================== - Hits 1866 1845 -21 + Misses 225 223 -2 + Partials 81 80 -1 ``` | [Files Changed](https://app.codecov.io/gh/quantumjot/btrack/pull/379?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe) | Coverage Δ | | |---|---|---| | [btrack/napari/widgets/\_general.py](https://app.codecov.io/gh/quantumjot/btrack/pull/379?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL25hcGFyaS93aWRnZXRzL19nZW5lcmFsLnB5) | `100.00% <ø> (ø)` | | | [btrack/napari/widgets/\_motion.py](https://app.codecov.io/gh/quantumjot/btrack/pull/379?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL25hcGFyaS93aWRnZXRzL19tb3Rpb24ucHk=) | `100.00% <ø> (ø)` | | | [btrack/napari/widgets/\_hypothesis.py](https://app.codecov.io/gh/quantumjot/btrack/pull/379?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL25hcGFyaS93aWRnZXRzL19oeXBvdGhlc2lzLnB5) | `100.00% <100.00%> (ø)` | | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/quantumjot/btrack/pull/379/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe)

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