Remove unused namespace alias

apps/mwiniimporter/importer.cpp

@@ -9,8 +9,6 @@
 #include <fstream>
 #include <iostream>
 
-namespace sfs = std::filesystem;
-
 namespace
 {
     // from configfileparser.cpp

apps/mwiniimporter/main.cpp

@@ -10,7 +10,6 @@
 #include <components/files/conversion.hpp>
 
 namespace bpo = boost::program_options;
-namespace sfs = std::filesystem;
 
 #ifndef _WIN32
 int main(int argc, char* argv[])