[clang-tidy] Remove redundant init

Found with modernize-use-default-member-init

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/Variant.cpp

@@ -108,8 +108,7 @@ Variant::Variant (const Variant& other)
 
 ////////////////////////////////////////////////////////////////////////////////
 Variant::Variant (const bool value)
-: _type (Variant::type_boolean)
-, _bool (value)
+: _bool (value)
 {
 }