Fix Rig.set_mem()

This is also swapping the arguments to make the vfo optional
like in other methods.

bindings/python/test_rig.py

@@ -195,7 +195,8 @@ class TestClass:
         assert rig.set_freq(freq, Hamlib.RIG_VFO_CURR) is None
         assert rig.set_func(0, 0, 0) is None
         assert rig.set_level(0, 0, 0) is None
-        assert rig.set_mem(0, 0) is None
+        assert rig.set_mem(0) is None
+        assert rig.set_mem(0, Hamlib.RIG_VFO_CURR) is None
         assert rig.set_mode(0) is None
         assert rig.set_mode(0, 0) is None
         assert rig.set_mode(0, 0, Hamlib.RIG_VFO_CURR) is None

bindings/rig.swg

@@ -384,7 +384,7 @@ typedef channel_t * const_channel_t_p;
 	METHOD2(set_func, setting_t, int)
 	METHOD2(set_ext_func, hamlib_token_t, int)
 	METHOD1(set_bank, int)
-	METHOD3(set_mem, int)
+	METHOD1(set_mem, int)
 	METHOD1(send_dtmf, const_char_string)
 	METHOD1(send_morse, const_char_string)
 	METHOD3(vfo_op, vfo_op_t)