chore(cpn): Fix Ubuntu compiler warnings (#4257)

companion/src/firmwares/edgetx/yaml_rawswitch.cpp

@@ -24,7 +24,6 @@
 std::string YamlRawSwitchEncode(const RawSwitch& rhs)
 {
   std::string sw_str;
-  char c = 'A';
   int32_t sval = rhs.index;
   if (rhs.index < 0) {
     sval = -sval;

companion/src/simulation/debugoutput.cpp

@@ -300,9 +300,6 @@ QRegularExpression DebugOutput::makeRegEx(const QString & input, bool * isExlusi
   QString output(input);
   QRegularExpression re;
   QRegularExpression::PatternOptions reFlags = QRegularExpression::DontCaptureOption;
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 0))
-  reFlags |= QRegularExpression::OptimizeOnFirstUsageOption;
-#endif
 
   if (input.left(1) == "!") {
     output.remove(0, 1);