Change strict equality for active screens to use functions for readability

[NabbeunNabi]

Problem

We are using strict comparability often for what screen is active throughout the moderation panel. For example
v-else-if="moderationScreenStore.activeScreen === ModerationScreen.EditSubmission" in the ModTopbar.vue.

Success

The equalities are refactored into functions that make it readable. For example dashboardScreenIsActive()

Requirements

• Add functions for each active screen in the moderationScreenStore.ts
• Update where this is being used around the mod panel