Do not estimate balance for local channels

[thomash-acinq]

We already know th balance of local channels, we don't need to estimate it.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.98%. Comparing base (12df4ce) to head (cd3125a).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2988      +/-   ##
==========================================
- Coverage   86.02%   85.98%   -0.04%     
==========================================
  Files         227      227              
  Lines       20371    20374       +3     
  Branches      815      846      +31     
==========================================
- Hits        17524    17519       -5     
- Misses       2847     2855       +8     

Files with missing lines	Coverage Δ
...scala/fr/acinq/eclair/router/BalanceEstimate.scala	97.24% <100.00%> (-1.84%)	⬇️

... and 8 files with indirect coverage changes

[t-bast]

LGTM, let's see how this behaves now that we're ignoring local channels.