remove non-existant Activities from AndroidManifest.xml
remove non-existant Activities from AndroidManifest.xml

fixing lint error:
Class referenced in the manifest was not found in the project or the
libraries

h2ri/ChatSecureAndroid,n8fr8/ChatSecureAndroid,h2ri/ChatSecureAndroid,Heart2009/ChatSecureAndroid,bonashen/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,kden/ChatSecureAndroid,h2ri/ChatSecureAndroid,kden/ChatSecureAndroid,eighthave/ChatSecureAndroid,kden/ChatSecureAndroid,n8fr8/AwesomeApp,n8fr8/ChatSecureAndroid,eighthave/ChatSecureAndroid,guardianproject/ChatSecureAndroid,anvayarai/my-ChatSecure,prembasumatary/ChatSecureAndroid,Heart2009/ChatSecureAndroid,joskarthic/chatsecure,bonashen/ChatSecureAndroid,10045125/ChatSecureAndroid,joskarthic/chatsecure,anvayarai/my-ChatSecure,n8fr8/AwesomeApp,bonashen/ChatSecureAndroid,guardianproject/ChatSecureAndroid,n8fr8/AwesomeApp,Heart2009/ChatSecureAndroid,anvayarai/my-ChatSecure,10045125/ChatSecureAndroid,guardianproject/ChatSecureAndroid,eighthave/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,10045125/ChatSecureAndroid,n8fr8/ChatSecureAndroid,joskarthic/chatsecure