bin:no-ansi-sgr: Conform to specification

Previously - in the existence of other ANSI escape sequences - the
script deleted text due to the too broad regex. For example in:

    foo^[[K bar m

everything behind `foo` was deleted. Thus, only remove SGR sequences by
only matching the spec-allowed bytes.

.local/bin/no-ansi-sgr

@@ -5,4 +5,5 @@
 # Remove ANSI SGR (Select Graphic Rendition) escape sequences, e.g. setting
 # color or bold font.
 
-s/\[[^m]*m//g
+# TODO: Why is the range `[0-?]` invalid?
+s/\[[0-9:-?]*[ -/]*m//g