VST3: Remove unhelpful assertion

Some hosts (e.g. REAPER) will attempt to instantiate plug-ins with 64
active channels, and JUCE can't represent this layout. In this case,
failing to convert between VST3/JUCE layouts is not a logical error, so
asserting is not appropriate.

modules/juce_audio_processors/format_types/juce_VST3Common.h

@@ -485,7 +485,6 @@ inline std::optional<AudioChannelSet> getChannelSetForSpeakerArrangement (Steinb
         return AudioChannelSet::channelSetWithChannels (*order);
 
     // VST3 <-> JUCE layout conversion error: report this bug to the JUCE forum
-    jassertfalse;
     return {};
 }