Fix unbalanced COM refcount in findAllTypesForFile (#1665)#1675
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This PR fixes a memory leak where
VST3HostContextHeadlessinstances are leaked when scanning plugins viafindAllTypesForFile().Using
IncrementRef::yeson creation increments the refcount to 2, causing the object to persist after the temporary smart pointer goes out of scope. Changing it toIncrementRef::noproperly balances the reference count, matching the behavior already present increatePluginInstance().Fixes #1665.