bugfix & test: Fixed x-snowflake-id mask error and updated the bits and id unit tests.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.60%. Comparing base (0bf4fd7) to head (ac54c20).

Files	Patch %	Lines
lib/id/x_snowflake_id.go	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #14 +/- ## ========================================== + Coverage 75.35% 75.60% +0.25% ========================================== Files 58 58 Lines 7420 7415 -5 ========================================== + Hits 5591 5606 +15 + Misses 1422 1409 -13 + Partials 407 400 -7 ```

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