update DEFAULT_MBUF_BURST_SIZE to 64 which is default value for input packet queue

[codecov-commenter]

Codecov Report

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

Project coverage is 40.64%. Comparing base (b1eaf0e) to head (21df54a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #206 +/- ## ========================================== - Coverage 40.67% 40.64% -0.04% ========================================== Files 100 100 Lines 9462 9462 Branches 1394 1394 ========================================== - Hits 3849 3846 -3 - Misses 4798 4803 +5 + Partials 815 813 -2 ``` | [Flag](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/206/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/206/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | `40.64% <ø> (-0.04%)` | :arrow_down: | 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=CESNET#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.