Fix Linter warnings for inline calls with interface block imported from header with func.h suffix

[reuterbal]

Another beautiful edge case but this time purely in Linter recipes:

• apparently, interface blocks may not only be declared in .intfb.h headers, but also in .func.h headers
• inline calls with string parameters can actually be identified as inline calls (rather than array subscripts) by fparser

[github-actions[bot]]

Documentation for this branch can be viewed at https://sites.ecmwf.int/docs/loki/332/index.html

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.15%. Comparing base (b9be6f6) to head (b766924). Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #332 +/- ## ======================================= Coverage 95.15% 95.15% ======================================= Files 168 168 Lines 35417 35432 +15 ======================================= + Hits 33700 33715 +15 Misses 1717 1717 ``` | [Flag](https://app.codecov.io/gh/ecmwf-ifs/loki/pull/332/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ecmwf-ifs) | Coverage Δ | | |---|---|---| | [lint_rules](https://app.codecov.io/gh/ecmwf-ifs/loki/pull/332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ecmwf-ifs) | `96.39% <100.00%> (+0.01%)` | :arrow_up: | | [loki](https://app.codecov.io/gh/ecmwf-ifs/loki/pull/332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ecmwf-ifs) | `95.13% <ø> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ecmwf-ifs#carryforward-flags-in-the-pull-request-comment) to find out more.

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