SI-7931 fix Dscala.repl.vids and some string interpolation typos

That nice little `-Dscala.repl.vids` feature regressed in f56f9a3c when
a string.format was replaced by string interpolation.

The ones in scala-reflect were caught by Xlint (who knew building with
Xlint was actually useful...), the other was just luck.
Merge pull request #3956 from gourlaysama/wip/interp-warn

fix a few string interpolation typos