Beautify slightly the code

src/opds_dumper.cpp

@@ -134,10 +134,12 @@ std::map<std::string, std::string> iso639_3 = {
   {"bxr", "буряад хэлэн"},
   {"cbk", "chavacano"},
   {"cdo", "閩東語"},
+  {"dag", "Dagbani"},
   {"diq", "dimli"},
   {"dty", "डोटेली"},
   {"eml", "emiliân-rumagnōl"},
   {"fbs", "српскохрватски"},
+  {"ido", "ido"},
   {"kbp", "kabɩyɛ"},
   {"kld", "Gamilaraay"},
   {"lbe", "лакку маз"},
@@ -156,9 +158,7 @@ std::map<std::string, std::string> iso639_3 = {
   {"rmr", "Caló"},
   {"rmy", "romani shib"},
   {"roa", "romance languages"},
-  {"twi","twi"},
-  {"ido","ido"},
-  {"dag", "Dagbani"}
+  {"twi", "twi"}
 };
 
 std::once_flag fillLanguagesFlag;