Make string juxtaposition combine properly with string interpolations.

frog/leg/scanner/parser.dart

Index: frog/leg/scanner/parser.dart
diff --git a/frog/leg/scanner/parser.dart b/frog/leg/scanner/parser.dart
index 30e3a3eb306805588273b49f7235a9341927ef5c..b6554d5c3654b68c7b1cdde90d0030be1e4a7dd2 100644
--- a/frog/leg/scanner/parser.dart
+++ b/frog/leg/scanner/parser.dart
@@ -1222,7 +1222,7 @@ class Parser {
       count++;
     }
     if (count > 1) {
-      listener.handleLiteralStringJuxtaposition(count);
+      listener.handleStringJuxtaposition(count);
     }
     return token;
   }