Avoid unnecessary copy of vector

src/btop_menu.cpp

@@ -798,7 +798,7 @@ namespace Menu {
 	};
 
 	msgBox::msgBox() {}
-	msgBox::msgBox(int width, int boxtype, vector<string> content, string title)
+	msgBox::msgBox(int width, int boxtype, const vector<string>& content, string title)
 	: width(width), boxtype(boxtype) {
 		auto tty_mode = Config::getB("tty_mode");
 		auto rounded = Config::getB("rounded_corners");

src/btop_menu.hpp

@@ -61,7 +61,7 @@ namespace Menu {
 			Select
 		};
 		msgBox();
-		msgBox(int width, int boxtype, vector<string> content, string title);
+		msgBox(int width, int boxtype, const vector<string>& content, string title);
 
 		//? Draw and return box as a string
 		string operator()();