Just get plucky directly for now

cpp/lintian-ppa.cpp

@@ -338,7 +338,9 @@ int main(int argc, char* argv[]) {
 
     auto ubuntu_opt = lp->distributions["ubuntu"];
     distribution ubuntu = ubuntu_opt.value();
-    auto ds_opt = ubuntu.current_series;
+    // FIXME
+    //auto ds_opt = ubuntu.current_series;
+    auto ds_opt = ubuntu.getSeries("plucky");
     if (!ds_opt) {
         std::cerr << "Failed to get current_series.\n";
         return 1;