PLT-7375: Email batching not on by default for accounts that have never touched their email settings (#7206)

* PLT-7375: Send batched emails if batching is enabled and user has not explicitly set their email interval preference

* PLT-7375: Reverting 4cf316fcd

* PLT-7375: Send batched emails if batching is enabled and user has not explicitly set their email interval preference

* PLT-7375: EnableEmailBatching was accidentally flipped to true in 10dcdeca4b, causing config_test.go::TestConfigFromEnviroVars to fail

* PLT-7375: EnableEmailBatching was accidentally flipped to true in 10dcdeca4b, causing config_test.go::TestConfigFromEnviroVars to fail

* PLT-7375: Reverted accidental changes to config

* PLT-7375: Manually fixing config.

config/config.json

@@ -307,4 +307,4 @@
     "PluginSettings": {
         "Plugins": {}
     }
-}
+}