Mirror struct Aggref field order in _copyAggref().

This is cosmetic, and no supported release has the affected fields.

src/backend/nodes/copyfuncs.c

@@ -1244,8 +1244,8 @@ _copyAggref(const Aggref *from)
 	COPY_NODE_FIELD(aggfilter);
 	COPY_SCALAR_FIELD(aggstar);
 	COPY_SCALAR_FIELD(aggvariadic);
-	COPY_SCALAR_FIELD(aggpartial);
 	COPY_SCALAR_FIELD(aggcombine);
+	COPY_SCALAR_FIELD(aggpartial);
 	COPY_SCALAR_FIELD(aggkind);
 	COPY_SCALAR_FIELD(agglevelsup);
 	COPY_LOCATION_FIELD(location);