Remove highlight from course ID

[weiquu]

Experimental tweak to get familiar with teammates and how it is being structured.

PR Checklist

Ensure that you have:

• Read and understood our PR guideline: https://teammates.github.io/teammates/process.html#step-4-submit-a-pr
  • Added the issue number to the "Fixes" keyword above
  • Titled the PR as specified in the abovementioned document
• Made your changes on a branch other than master and release
• Gone through all the changes in this PR and ensured that:
  • They addressed one (and only one) issue
  • No unintended changes were made
• Run and passed static analysis: ./gradlew lint and npm run lint
• Added/updated tests, if changes in functionality were involved
• Added/updated documentation to public APIs (classes, methods, variables), if applicable

Outline of Problem
Previously, the instructor's Search Students page would highlight the course ID if the search term appeared there. A quick search through issues regarding "highlight" does not yield much about this particular behaviour. However, I believe that this is unintended as the search is meant to search for students only, hence only data from students should be highlighted. In addition, simply searching for the course ID (without any matches for students) gives no results, implying that the course ID shouldn't be "gone through" by the search term.

Outline of Solution
Removed the portion of code causing the course ID to be highlighted. See below for a comparison between before and after: