Fix: fetch static metadata when no cell type

[jefferis]

• cf_meta was missing e.g. side information for cells without a cell type when using static cell types
• this was because the default regular expression was only being tested against cell_type, whereas for flytable queries super_class cell_class etc could also match

[codecov[bot]]

Codecov Report

Merging #180 (a372a48) into master (357d5ab) will increase coverage by 0.02%. The diff coverage is 100.00%.

:exclamation: Current head a372a48 differs from pull request most recent head 2d31719. Consider uploading reports for the commit 2d31719 to get more accurate results

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   53.86%   53.89%   +0.02%     
==========================================
  Files          38       38              
  Lines        4691     4691              
==========================================
+ Hits         2527     2528       +1     
+ Misses       2164     2163       -1     

Files Changed	Coverage Δ
R/flytable.R	66.38% <100.00%> (+0.16%)	:arrow_up:

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