Bail out early if the new pipeline key matches that of the current one

Prevents the transition cache of some pipelines from getting full of copies of itself in cases where an update happens redundantly.

app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp

@@ -667,6 +667,9 @@ namespace skyline::gpu::interconnect::maxwell3d {
     }
 
     Pipeline *Pipeline::LookupNext(const PackedPipelineState &packedState) {
+        if (packedState == sourcePackedState)
+            return this;
+
         auto it{std::find_if(transitionCache.begin(), transitionCache.end(), [&packedState](auto pipeline) {
             if (pipeline && pipeline->sourcePackedState == packedState)
                 return true;