Revert "tg-fixits.td: fixup for Linux"

It's better to show no caret/ranges/fixits than to show them misaligned.
(It scares me a bit that Clang is going to show them misaligned on
systems without a proper llvm::sys::locale::columnWidth.) See PR14910.

This reverts commit a03cc72bedd015b7eb76e9ac650992f58a48549d.