Cleanup: use arrays instead of object deconstruction for multi-styles

[SyntaxBlitz]

A StackOverflow post lied to me and told me that {...styles.one, ...styles.two} was the "best" way to merge styles. Later I found out you can just pass in an array: [styles.one, styles.two] which seems a lot better (this is my first react native app!!). We should clean up instances of the former.

[schonfeld]

I think I got most of those done in #27