Remove spaces from column names when comparing

Consider the following:
SELECT SUM (minutes)
and
SELECT SUM(minutes)

SQLite names the columns differently because of the extra space after SUM.
We should normalize out spaces from column names when comparing.

Test Plan:
- Load /computing/hour-of-code/hour-of-sql/p/challenge-book-list-database
- Put a space after the SUM and make sure the code is accepted still.

Auditors: pamela