[sr-dev] [kamailio/kamailio] core: Fix the cfg framework variable input type default (#2022)

[Mancaș George]

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#### Type Of Change
- [x] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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- [ ] PR should be backported to stable branches
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- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description

What the affected line of code really wants to achieve is: if an
accepted inputs type mask is not specified then default to accepting
only the actual variable type. So we must mask the var type first,
then shift it by `CFG_INPUT_SHIFT`, before or-ing it with the rest.

What happened before was that the entire type was shifted, and that
included var type, input type and flags. What we end up with is some
additional higher bits set (for flags). I actually discovered this while
adding an additional flag that was meant to mark variables as private,
only accessible through an internal API (not available to modules such
as cfg_rpc).
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2022

-- Commit Summary --

  * core: Fix the cfg framework variable input type default

-- File Changes --

    M src/core/cfg/cfg.c (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2022.patch
https://github.com/kamailio/kamailio/pull/2022.diff

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