smithlab_utils.hpp: fixing a non-standard escape sequence for percent symbol

Author: andrewdavidsmith

smithlab_utils.hpp

@@ -430,7 +430,7 @@ class ProgressBar {
   std::string left_tag = "\r[";
   std::string mid_tag;
   std::string bar;
-  std::string right_tag = "\%]";
+  std::string right_tag = "%%]";
 
   static const size_t max_bar_width = 72;
 };