SDK: remove default.properties from ApiDemos

It's annoying to have to maintain this. Remove it and understand
why we needed it in the first place. If we do, we'll generate
it when packaging the SDK rather than have it in the tree.

SDK BUG 2144477

samples/ApiDemos/default.properties

@@ -1,11 +0,0 @@
-# This file is automatically generated by Android Tools.
-# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
-# 
-# This file must be checked in Version Control Systems.
-# 
-# To customize properties used by the Ant build system use,
-# "build.properties", and override values to adapt the script to your
-# project structure.
-
-# Project target.
-target=android-Eclair