Fix file transfer tests and comments

fileTransfer/connect/listener.go

fileTransfer/connect/params.go

fileTransfer/connect/params_test.go

fileTransfer/connect/wrapper.go

fileTransfer/connect/wrapper_test.go

fileTransfer/e2e/listener.go

fileTransfer/e2e/params.go

fileTransfer/e2e/params_test.go

fileTransfer/e2e/send.go

fileTransfer/e2e/wrapper.go

fileTransfer/groupChat/wrapper.go

fileTransfer/manager_test.go

fileTransfer/params.go

fileTransfer/params_test.go