Fix production build

[luisherranz]

What

1. Fix the production tests, which were not passing correctly
2. Fix the ownKeys trap, which was not working in production
3. Fix the peek function, which was not working in production

Why

Because the production tests were broken.

How

1. Filter correctly the deepsignal packages in Karma.
2. Reassing the value to itself to prevent the JS minifier from removing the .value access.
3. Wrap the last flag in a try/catch to prevent the JS minifier from reordering the assignments.

[github-actions]

Size Change: +105 B (+2%)

Total Size: 6.2 kB

Filename	Size	Change
packages/deepsignal/core/dist/deepsignal-core.js	1.01 kB	+18 B (+2%)
packages/deepsignal/core/dist/deepsignal-core.mjs	1 kB	+17 B (+2%)
packages/deepsignal/dist/deepsignal.js	1.05 kB	+20 B (+2%)
packages/deepsignal/dist/deepsignal.mjs	1.04 kB	+16 B (+2%)
packages/deepsignal/react/dist/deepsignal-react.js	1.05 kB	+19 B (+2%)
packages/deepsignal/react/dist/deepsignal-react.mjs	1.04 kB	+15 B (+1%)

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