Remove non-control characters check

src/users.c

@@ -46,10 +46,7 @@ static bool is_escape_char(char c)
 	    c == '\t' ||
 	    c == '\v' ||
 	    c == '\r' ||
-	    c == '\n' ||
-	    c == '\\' ||
-	    c == '&' ||
-	    c == ';')
+	    c == '\n')
 		return true;
 
 	return false;