fixes some uninit bool loads (#5644)

This commit fixes some bool loads which are not initialized. With ubsan and the "option -fsanitize=bool", this results in a runtime error during test execution.

Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>

code/PostProcessing/LimitBoneWeightsProcess.cpp

@@ -53,7 +53,8 @@ namespace Assimp {
 
 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
-LimitBoneWeightsProcess::LimitBoneWeightsProcess() : mMaxWeights(AI_LMW_MAX_WEIGHTS) {
+LimitBoneWeightsProcess::LimitBoneWeightsProcess() :
+        mMaxWeights(AI_LMW_MAX_WEIGHTS), mRemoveEmptyBones(true) {
     // empty
 }