Fix adbd/adb server confusion in an error message.

        if (result->connection_state == kCsUnauthorized) {

            *error_out = "device unauthorized.\n";

            char* ADB_VENDOR_KEYS = getenv("ADB_VENDOR_KEYS");

            *error_out += "This adbd's $ADB_VENDOR_KEYS is ";

            *error_out += "This adb server's $ADB_VENDOR_KEYS is ";

            *error_out += ADB_VENDOR_KEYS ? ADB_VENDOR_KEYS : "not set";

            *error_out += "; try 'adb kill-server' if that seems wrong.\n";

            *error_out += "\n";

            *error_out += "Try 'adb kill-server' if that seems wrong.\n";

            *error_out += "Otherwise check for a confirmation dialog on your device.";

            result = NULL;

        }