Fix `ChainGraph` bug where reintroduced txs cannot resolve conflicts

[evanlinjin]

• Fix ChainGraph::fix_conflicts logic
• Add test_apply_changes_reintroduce_tx test

[codecov-commenter]

Codecov Report

Merging #143 (4ffbb16) into master (362cc64) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #143   +/-   ##
=======================================
  Coverage   63.26%   63.26%           
=======================================
  Files           8        8           
  Lines         294      294           
=======================================
  Hits          186      186           
  Misses        108      108           

Impacted Files	Coverage Δ
bdk_chain/src/chain_graph.rs	0.00% <ø> (ø)

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[evanlinjin]

Replaced by #145