namespace_linter() handles backticked operators

[IndrajeetPatil]

Closes #1752

library(lintr)

lint(
  text = "magrittr::`%>%`",
  linters = namespace_linter()
)

lint(
  text = "magrittr::'%>%'",
  linters = namespace_linter()
)

^{Created on 2022-10-24 with reprex v2.0.2}

[codecov-commenter]

Codecov Report

Merging #1753 (df7a8ac) into main (1ac48e9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1753   +/-   ##
=======================================
  Coverage   98.87%   98.87%           
=======================================
  Files         109      109           
  Lines        4623     4624    +1     
=======================================
+ Hits         4571     4572    +1     
  Misses         52       52           

Impacted Files	Coverage Δ
R/namespace_linter.R	100.00% <100.00%> (ø)

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[AshesITR]

Thanks!