LibCore: Implement System::current_executable_path on Windows

Author: https://github.com/stasoid
Commit: 10db20a537
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3002
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibCore/SystemWindows.cpp

@@ -11,6 +11,7 @@
 
 #include <AK/ByteString.h>
 #include <AK/ScopeGuard.h>
+#include <LibCore/Process.h>
 #include <LibCore/System.h>
 #include <direct.h>
 #include <sys/mman.h>
@@ -263,4 +264,9 @@ u64 physical_memory_bytes()
     return ms.ullTotalPhys;
 }
 
+ErrorOr<ByteString> current_executable_path()
+{
+    return TRY(Process::get_name()).to_byte_string();
+}
+
 }