use four digit umask in wrapper.config

According to http://wrapper.tanukisoftware.com/doc/english/prop-umask.html the
umask is a four digit number.

installer/resources/wrapper.config

@@ -254,7 +254,7 @@ wrapper.console.title=I2P Service
 # for a detailed explanation of these settings.
 wrapper.umask=0022
 wrapper.java.umask=0022
-wrapper.logfile.umask=077
+wrapper.logfile.umask=0077
 
 #********************************************************************
 # Wrapper NT Service Properties