android: Enable charon.initiator_only option

src/frontends/android/jni/libandroidbridge/charonservice.c

@@ -468,6 +468,8 @@ static void set_options(char *logfile)
 					"charon.retransmit_base", ANDROID_RETRANSMIT_BASE);
 	lib->settings->set_int(lib->settings,
 					"charon.fragment_size", ANDROID_FRAGMENT_SIZE);
+	lib->settings->set_bool(lib->settings,
+					"charon.initiator_only", TRUE);
 	lib->settings->set_bool(lib->settings,
 					"charon.close_ike_on_child_failure", TRUE);
 	/* setting the source address breaks the VpnService.protect() function which