Fix flytable maximum cells error by adjusting chunksize

[jefferis]

• Error in flytable_list_rows("info")

 #> Error in py_call_impl(x, dots$args, dots$keywords): ConnectionError: [Errno 413] {"error_msg":"the number of cells accessing the table exceeds the limit"}

• turns out that there is now a limit in the number of cells that you can return of 1,000,000
• reported by @YijieYin
• @schlegelp FYI

[codecov]

Codecov Report

Merging #147 (91707ff) into master (6f10ced) will increase coverage by 0.14%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   47.69%   47.83%   +0.14%     
==========================================
  Files          29       29              
  Lines        3537     3541       +4     
==========================================
+ Hits         1687     1694       +7     
+ Misses       1850     1847       -3     

Impacted Files	Coverage Δ
R/flytable.R	67.40% <85.71%> (+1.20%)	⬆️

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