Fix sigma/omgea parse with boundaries

[codecov[bot]]

Codecov Report

Patch coverage: 97.72% and project coverage change: +0.04 :tada:

Comparison is base (cef6736) 90.66% compared to head (2d774d7) 90.70%.

:exclamation: Current head 2d774d7 differs from pull request most recent head 6aab736. Consider uploading reports for the commit 6aab736 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #152 +/- ## ========================================== + Coverage 90.66% 90.70% +0.04% ========================================== Files 52 53 +1 Lines 6342 6383 +41 ========================================== + Hits 5750 5790 +40 - Misses 592 593 +1 ``` | [Impacted Files](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2) | Coverage Δ | | |---|---|---| | [R/sub.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9zdWIuUg==) | `89.18% <ø> (-0.82%)` | :arrow_down: | | [R/advan5.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9hZHZhbjUuUg==) | `96.66% <96.66%> (ø)` | | | [R/nonmem2rx.R](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-Ui9ub25tZW0ycnguUg==) | `85.54% <100.00%> (+0.11%)` | :arrow_up: | | [src/abbrev.c](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-c3JjL2FiYnJldi5j) | `96.96% <100.00%> (+<0.01%)` | :arrow_up: | | [src/omega.c](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-c3JjL29tZWdhLmM=) | `97.42% <100.00%> (+0.02%)` | :arrow_up: | | [src/util.cpp](https://app.codecov.io/gh/nlmixr2/nonmem2rx/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nlmixr2#diff-c3JjL3V0aWwuY3Bw) | `92.53% <100.00%> (+0.12%)` | :arrow_up: |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.