Use correct log index in inclusion proof

[cdris]

Summary

Swaps to using the inclusion proof log index instead of the entry log index in the inclusion proof struct.

[codecov]

Codecov Report

Merging #1599 (bcea467) into main (2bd83da) will decrease coverage by 19.23%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #1599       +/-   ##
===========================================
- Coverage   67.00%   47.78%   -19.23%     
===========================================
  Files          83       75        -8     
  Lines        8389     7775      -614     
===========================================
- Hits         5621     3715     -1906     
- Misses       2092     3700     +1608     
+ Partials      676      360      -316     

Flag	Coverage Δ
e2etests	?
unittests	47.78% <100.00%> (+0.03%)	⬆️

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Files Changed	Coverage Δ
pkg/tle/tle.go	96.29% <100.00%> (ø)

... and 55 files with indirect coverage changes