rust highlighter: '"' is not the start of a string

this uses the string opening regex from the c-family highlighter to prevent
highlighting the rest of the file as a string on encountering the character
literal '"'

rc/base/rust.kak

@@ -12,7 +12,7 @@ hook global BufCreate .*[.](rust|rs) %{
 # ‾‾‾‾‾‾‾‾‾‾‾‾
 
 add-highlighter -group / regions -default code rust \
-    string  '"' (?<!\\)(\\\\)*"        '' \
+    string  %{(?<!')"} (?<!\\)(\\\\)*"        '' \
     comment //          $                     '' \
     comment /\*        \*/                   /\*