Removed unused Observable import

After updating the code for Fuse 0.24, we didn't need this import anymore. Didn't realize that until just now :)

Author: ferris

Pages/EditHikePage.js

@@ -1,4 +1,3 @@
-var Observable = require("FuseJS/Observable");
 var Context = require("Modules/Context");
 
 var hike = this.Parameter;