Explicitly make default case break for Maxwell3D::HandleMethod

This being made implicit removes any confusion that all cases would need to be implemented and explicitly define that the CF should continue onto the 2nd switch-case when it cannot find any matches in the first one.

app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp

@@ -377,6 +377,9 @@ namespace skyline::soc::gm20b::engine::maxwell3d {
                 BOOST_PP_REPEAT(6, SET_SHADER_ENABLE_CALLBACK, 0)
                 static_assert(type::StageCount == 6 && type::StageCount < BOOST_PP_LIMIT_REPEAT);
                 #undef SET_SHADER_ENABLE_CALLBACK
+
+                default:
+                    break;
             }
         }