Compilation warning from docbook code

[Scott Kostyshak]

I get the following warning on current master:

  [ 93%] Building CXX object src/CMakeFiles/lyx.dir/output_docbook.cpp.o
  44:19: warning: ‘const string lyx::{anonymous}::fontToDocBookTag(lyx::xml::FontTypes)’ defined but not used [-Wunused-function]
     44 | std::string const fontToDocBookTag(xml::FontTypes type) {
        |                   ^~~~~~~~~~~~~~~~

By the way, thanks to Thibaut and Pavel for the work.

Scott
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