LibRegex: Make regex::Regex move-constructible and move-assignable

For some reason the default move constructor and default move-assign
operator were deleted, so we explicitly default them instead.

Userland/Libraries/LibRegex/RegexMatcher.h

@@ -77,6 +77,8 @@ public:
 
     explicit Regex(StringView pattern, typename ParserTraits<Parser>::OptionsType regex_options = {});
     ~Regex() = default;
+    Regex(Regex&&) = default;
+    Regex& operator=(Regex&&) = default;
 
     typename ParserTraits<Parser>::OptionsType options() const;
     void print_bytecode(FILE* f = stdout) const;