[locale.moneypunct.virtuals] latex: remove redundant backslash-space

[morinmorin]

The backslash-space in "U.S.\ locales" can be replaced with a plain space, because TeX treats a period after uppercase as an acronym (which yields normal spacing). L4595, L4610 already use a plain space in "U.S. locales", so this change improves consistency.

[tkoeppe]

OK, but is this the only place in the entire standard where the backslash is redundant? Since this doesn't affect anything, I'd rather only consider such cleanups if it's the last and only time we'll ever have to think about this.

[morinmorin]

Other than bibliography, I think yes. I checked with this command: grep -P -n '[A-Z][.?!:;]\\\s' *.tex.