sql: remove fiber_gc() from sqlite3VdbeHalt()

Too many autogenerated ids leads to SEGFAULT. This problem
appeared because region was cleaned twice: once in
sqlite3VdbeHalt() and once in sqlite3VdbeDelete() which was
executed during sqlite3_finalize(). Autogenerated ids that were
saved there, were fetched after sqlite3VdbeHalt() and before
sqlite3_finalize(). In this patch region cleaning in
sqlite3VdbeHalt() has been removed.

Follow up #2618
Follow up #3199