buf in pdb_msg_dbg should correctly accomodate for pdb_bdy size pdb_hdr + pdb_bdy should add to pdb_hdr.length (max 255)

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#### Description <!-- Describe your changes in detail -->

Can I also port this back to 4.4? Thank you. You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/1693

-- Commit Summary --

* pdb: fix SIGABRT in case of too long uris

-- File Changes --

M src/modules/pdb/common.h (3) M src/modules/pdb/pdb.c (5)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1693.patch https://github.com/kamailio/kamailio/pull/1693.diff