italicparser: Parse(): Add static keyword to regex

In line with the other parsers, add the static keyword to the
regex.

AUTHORS

@@ -9,3 +9,4 @@ Patrick José Pereira (patrickelectric@gmail.com)
 Martin Kopecky (martin.kopecky357@gmail.com)
 Andrew Mettlach (dmmettlach@gmail.com)
 Evan Klitzke (evan@eklitzke.org)
+Albert Schwarzkopf (dev-maddy@quitesimple.org)