No need for gettextf without '%' template

[MichaelChirico]

Found by improved {lintr} logic: r-lib/lintr#2894

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.77%. Comparing base (cfa9f49) to head (f4d6a57).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7223   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          81       81           
  Lines       15219    15219           
=======================================
  Hits        15033    15033           
  Misses        186      186           

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[github-actions]

No obvious timing issues in HEAD=static-gettextf

Generated via commit f4d6a57

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	4 minutes and 55 seconds
Installing different package versions	10 minutes and 1 seconds
Running and plotting the test cases	2 minutes and 33 seconds