fix stale flytable base cache

[jefferis]

• switching to non-memoised inside a memoised fn isn't going to work

[codecov[bot]]

Codecov Report

Merging #175 (bd004a8) into master (5617c75) will increase coverage by 0.03%. The diff coverage is 86.66%.

:exclamation: Current head bd004a8 differs from pull request most recent head ae2a92d. Consider uploading reports for the commit ae2a92d to get more accurate results

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   53.89%   53.92%   +0.03%     
==========================================
  Files          38       38              
  Lines        4691     4701      +10     
==========================================
+ Hits         2528     2535       +7     
- Misses       2163     2166       +3     

Files Changed	Coverage Δ
R/flytable.R	66.44% <86.66%> (+0.05%)	:arrow_up:

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