remove unused global variable
remove unused global variable

$deployed_app_path has been used for "rake profile:device" in iOS.
However, "rake profile" is not support in tvOS.

katsuyoshi/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,HipByte/RubyMotion