core/txpool: no need to run rotate if no local txs

[ucwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.43%. Comparing base (ad351d9) to head (0245248).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1922      +/-   ##
==========================================
- Coverage   47.44%   47.43%   -0.01%     
==========================================
  Files         568      568              
  Lines       68782    68785       +3     
==========================================
- Hits        32634    32629       -5     
- Misses      33603    33619      +16     
+ Partials     2545     2537       -8     

Files	Coverage Δ
core/txpool/journal.go	70.51% <100.00%> (+1.17%)	⬆️

... and 12 files with indirect coverage changes