Do not send the same packet to the same node twice

[kurnevsky]

It's a bug introduced in c-toxcore after assocs refactoring. See the original code: https://github.com/irungentoo/toxcore/blob/bf69b54f64003d160d759068f4816b2d9b2e1e21/toxcore/DHT.c#L1740-L1763

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This change is 

[zoff99]

@kurnevsky are you sure this is correct?

[kurnevsky]

@zoff99 I think yes, friend_sent in the current code does nothing while it's supposed to prevent sending packets to same nodes (check the original code). Now it can be done with a simple break since we have inner loop by node's addresses.

[zoff99]

sorry did not see the inner loop. damn folding :-)

line 2004 - 2007 does not do anything even now. thats the issue then i guess. alright

[sudden6]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! 1 of 1 approvals obtained

[codecov]

Codecov Report

Merging #1310 into master will decrease coverage by 1.1%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master   #1310     +/-   ##
========================================
- Coverage    84.1%   82.9%   -1.2%     
========================================
  Files          86      82      -4     
  Lines       15708   14975    -733     
========================================
- Hits        13218   12429    -789     
- Misses       2490    2546     +56

Impacted Files	Coverage Δ
toxcore/DHT.c	77.7% <100%> (ø)	⬆️
toxcore/group.c	78.8% <0%> (-13.1%)	⬇️
toxcore/state.c	66.6% <0%> (-7.4%)	⬇️
toxcore/tox_api.c	61.2% <0%> (-3.6%)	⬇️
toxcore/TCP_server.c	80.3% <0%> (-2.4%)	⬇️
toxcore/LAN_discovery.c	84.9% <0%> (-1.9%)	⬇️
toxencryptsave/toxencryptsave.c	70.2% <0%> (-1.7%)	⬇️
toxcore/friend_connection.c	94.9% <0%> (-1.1%)	⬇️
toxav/toxav.c	66.6% <0%> (-1%)	⬇️
toxcore/util.c	60% <0%> (-0.9%)	⬇️
... and 57 more

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