WX: Fix argument parsing

Manually convert each argument to a UTF-8 std::string, because the
implicit conversion for wxCmdLineArgsArray to char** calls ToAscii
(which is obviously undesired).

Fixes https://bugs.dolphin-emu.org/issues/10274

Source/Core/UICommon/CommandLineParse.h

@@ -3,6 +3,8 @@
 // Refer to the license.txt file included.
 
 #include <memory>
+#include <string>
+#include <vector>
 
 namespace optparse
 {
@@ -20,4 +22,6 @@ enum class ParserOptions
 
 std::unique_ptr<optparse::OptionParser> CreateParser(ParserOptions options);
 optparse::Values& ParseArguments(optparse::OptionParser* parser, int argc, char** argv);
+optparse::Values& ParseArguments(optparse::OptionParser* parser,
+                                 const std::vector<std::string>& arguments);
 }