Fix loading soundfonts in rack mode

source/backend/plugin/CarlaPluginFluidSynth.cpp

@@ -873,7 +873,7 @@ public:
         pData->extraHints  = 0x0;
         pData->extraHints |= PLUGIN_EXTRA_HINT_HAS_MIDI_IN;
 
-        if (kUse16Outs)
+        if (! kUse16Outs)
             pData->extraHints |= PLUGIN_EXTRA_HINT_CAN_RUN_RACK;
 
         bufferSizeChanged(pData->engine->getBufferSize());