updated the 'id' that notifications are created, defaulting to topic:{tid} now
updated the 'id' that notifications are created, defaulting to topic:{tid} now

barisusakli/nodebb-plugin-mentions,exo-do/nodebb-plugin-mentions-exodo,julianlam/nodebb-plugin-mentions,drewdotpro/nodebb-plugin-mentions,exo-do/nodebb-plugin-mentions