Log non-fatal mod name conflict to actionstream instead of errorstream

src/mods.cpp

@@ -309,7 +309,7 @@ void ModConfiguration::addMods(std::vector<ModSpec> new_mods)
 				// BAD CASE: name conflict in different levels.
 				u32 oldindex = existing_mods[mod.name];
 				const ModSpec &oldmod = m_unsatisfied_mods[oldindex];
-				errorstream<<"WARNING: Mod name conflict detected: \""
+				actionstream<<"WARNING: Mod name conflict detected: \""
 					<<mod.name<<"\""<<std::endl
 					<<"Will not load: "<<oldmod.path<<std::endl
 					<<"Overridden by: "<<mod.path<<std::endl;