[locale.moneypunct.virtuals] remove redundant backslash-space (#8159)

TeX already treats a period after uppercase as an acronym (which yields normal spacing).

Author: morinmorin

source/text.tex

@@ -4673,7 +4673,7 @@
 \returns
 The number of digits after the decimal radix separator, if any.
 \begin{footnote}
-In common U.S.\ locales, this is 2.
+In common U.S. locales, this is 2.
 \end{footnote}
 \end{itemdescr}