fix: ISEB is not included in buildingCatalogue.ts

[KevinWu098]

We sourced our data in buildingCatalogue.ts from https://classrooms.uci.edu/classrooms/, but their directory doesn't include ISEB. There are indeed courses hosted in ISEB (although few), and it's a popular spot to study/have events, so custom events may want to use ISEB as a location.

We should add ISEB to our list; whether we manually create that data point or find a new, more comprehensive list can be at the PR's discretion

From user feedback:

ISEB does not exist as a location.