cleanup: replace tabs with spaces

[nurupo]

c-toxcore$ grep -Ps --line-number '\t' * -R | grep '\.[c|h]:[0-9]\+'
other/bootstrap_daemon/src/tox-bootstrapd.c:457:                kill_gca(group_announce);
toxcore/Messenger.c:2027:       set_friend_status(m, i, FRIEND_CONFIRMED, userdata);
toxcore/Messenger.c:2406:           case PACKET_ID_INVITE_GROUPCHAT:
toxcore/Messenger.c:2407:               return m_handle_packet_invite_groupchat(m, i, data, data_length, userdata);

@Green-Sky (d3819b2) and @JFreegman (0a277b5) have been charged with the heinous crime of tab-berdashery -- the unlawful act of indentation injustice that has left the codebase in a state of uneven spacing disbelief, causing unsuspecting developers to question the very fabric of code aesthetics. Authorities recommend a strict sentence of space-indentation rehabilitation by having to code-review the correctional action of tabs being replaced by spaces.

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This change is 

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (1b6dee7) 74.38% compared to head (a4df286) 74.38%.

Files	Patch %	Lines
toxcore/Messenger.c	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2449   +/-   ##
=======================================
  Coverage   74.38%   74.38%           
=======================================
  Files          87       87           
  Lines       26255    26255           
=======================================
+ Hits        19529    19531    +2     
+ Misses       6726     6724    -2     

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[Green-Sky]

😆

[nurupo]

Waiting on @JFreegman to approve the review too :D

[JFreegman]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained