Added trailing comma to js files.

The lack of trailing commas in these module definitions
were causing exceptions when concatenated with other js
files.

dbf.js

@@ -245,5 +245,5 @@
 
     window["DBF"] = DBF;
 
-})(self)
+})(self);
 

shapefile.js

@@ -371,5 +371,5 @@
     }
 
     window["Shapefile"] = Shapefile;
-})(self)
+})(self);