Swap: Allow cancel for alice refundsig before arb lock

[TheCharlatan]

Alice should be able to cancel the swap up until the point where Bob's lock has confirmed.

[codecov-commenter]

Codecov Report

Merging #518 (cfff1f5) into main (482985f) will decrease coverage by 0.0%.
The diff coverage is 0.0%.

@@           Coverage Diff           @@
##            main    #518     +/-   ##
=======================================
- Coverage   12.4%   12.4%   -0.0%     
=======================================
  Files         34      34             
  Lines       9995   10017     +22     
=======================================
  Hits        1238    1238             
- Misses      8757    8779     +22     

Impacted Files	Coverage Δ
src/swapd/runtime.rs	0.0% <0.0%> (ø)
src/swapd/swap_state.rs	0.0% <0.0%> (ø)

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[zkao]

simple, and add btc locked state that was previously missing