tests: fix esingle-payer-swap e2e subs test

[algorandskiy]

Summary

Prevent test failure when base64 encoded fields have "fee" substring.

code:

FOUND=$(msgpacktool -d < cheap.txn | grep fee)
set -e
if [[ $FOUND != "" ]]; then
    date "+{scriptname} FAIL fee was improperly encoded $FOUND %Y%m%d_%H%M%S"
    false
fi

Output

{scriptname} FAIL fee was improperly encoded     "rcv:b64": "0X97nHcwgnkkYfeeY5XGNP6gVUpfbRUJMPNi8tMp4t8=", 20230310_160027

Test Plan

This is a test fix

[codecov]

Codecov Report

Merging #5189 (ad42f2a) into master (485ad92) will decrease coverage by 11.35%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5189       +/-   ##
===========================================
- Coverage   53.49%   42.15%   -11.35%     
===========================================
  Files         439      439               
  Lines       55004    55004               
===========================================
- Hits        29426    23187     -6239     
- Misses      23288    29485     +6197     
- Partials     2290     2332       +42     

see 219 files with indirect coverage changes

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