Panzer: miniem: explicitly stop stacked timer

This necessary for the Kokkos profiling tools to work properly
with the stacked timers.  See comment in item 1 of
trilinos#4138 (comment).

packages/panzer/mini-em/example/BlockPrec/main.cpp

@@ -694,6 +694,7 @@ int main_(Teuchos::CommandLineProcessor &clp, int argc,char * argv[])
 
   // Output timer data
   if (use_stacked_timer) {
+    stacked_timer->stop("Mini-EM");
     Teuchos::StackedTimer::OutputOptions options;
     options.output_fraction = options.output_histogram = options.output_minmax = true;
     stacked_timer->report(*out, comm, options);