stream: pass properties to context_new

Whe  using pw_*_new_simple(), pass the properties to the automatically
created context as well so that we can configure it.

This makes it possible to, for example, load the client-rf.conf using the
simple API as well.

src/examples/audio-capture.c

@@ -143,6 +143,7 @@ int main(int argc, char *argv[])
 	 * the data.
 	 */
 	props = pw_properties_new(PW_KEY_MEDIA_TYPE, "Audio",
+			PW_KEY_CONFIG_NAME, "client-rt.conf",
 			PW_KEY_MEDIA_CATEGORY, "Capture",
 			PW_KEY_MEDIA_ROLE, "Music",
 			NULL);