gprc-zpages: do not output uglified js when building (#304)

This makes the output easier to use, and there's not a real need for
uglified js in this tool. This also eliminates the hash appended to
the output filenames.

grpc-zpages/buildscripts/update_angular.sh

@@ -13,5 +13,4 @@ if [[ $(which ng) == "" ]]; then
   exit 1
 fi
 
-ng build --prod --build-optimizer --base-href=/dist_channelz/
+ng build --base-href=/dist_channelz/
-