Unique{Scott,Michel,Gibbons,Yvert}NumbersValidator: fix warnings from PMD by extracting variable.

Should be in 49e6a0cbaa2e86570cce9549796272761241c37e commit.

No functional changes.
UniqueLoginValidator: fix warning from PMD by extracting variable.

Should be in 635dbc642eee9c1ae329e57bc03a27b0e92f02cd commit.

No functional changes.