Revert "main: Add a working directory option."

This reverts commit 210199db1c.

main.cpp

@@ -39,11 +39,6 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <iostream>
 #include <CLI11.hpp>
 #include <loguru.hpp>
-#ifdef _WIN32
-#include <direct.h>
-#else
-#include <unistd.h>
-#endif
 
 using namespace std;
 
@@ -69,21 +64,6 @@ static string appDescription = string(
     "\n"
 );
 
-/// Check for an existing directory (returns error message if check fails)
-class WorkingDirectoryValidator : public CLI::detail::ExistingDirectoryValidator {
-  public:
-    WorkingDirectoryValidator() {
-        func_ = [](std::string &filename) {
-            std::string result = CLI::ExistingDirectory.operator()(filename);
-            if (result.empty())
-                _chdir(filename.c_str());
-            return result;
-        };
-    }
-};
-
-const WorkingDirectoryValidator WorkingDirectory;
-
 void run_machine(std::string machine_str, std::string bootrom_path, uint32_t execution_mode, uint32_t profiling_interval_ms);
 
 int main(int argc, char** argv) {
@@ -97,14 +77,11 @@ int main(int argc, char** argv) {
     bool   realtime_enabled = false;
     bool   debugger_enabled = false;
     string bootrom_path("bootrom.bin");
-    string working_directory_path(".");
 
     app.add_flag("-r,--realtime", realtime_enabled,
         "Run the emulator in real-time");
     app.add_flag("-d,--debugger", debugger_enabled,
         "Enter the built-in debugger");
-    app.add_option("-w,--workingdir", working_directory_path, "Specifies working directory")
-        ->check(WorkingDirectory);
     app.add_option("-b,--bootrom", bootrom_path, "Specifies BootROM path")
         ->check(CLI::ExistingFile);
     app.add_flag("--deterministic", is_deterministic,