hide theme selector in prod (#2671)

...snapshots/Accounts-closes-an-account-1-chromium-linux.png

...snapshots/Accounts-closes-an-account-2-chromium-linux.png

...snapshots/Accounts-closes-an-account-3-chromium-linux.png

...snapshots/Accounts-closes-an-account-4-chromium-linux.png

...snapshots/Accounts-closes-an-account-5-chromium-linux.png

...snapshots/Accounts-closes-an-account-6-chromium-linux.png

...iews-the-initial-balance-transaction-1-chromium-linux.png

...iews-the-initial-balance-transaction-2-chromium-linux.png

...iews-the-initial-balance-transaction-3-chromium-linux.png

...verspent-budgeted-and-for-next-month-1-chromium-linux.png

...verspent-budgeted-and-for-next-month-2-chromium-linux.png

...verspent-budgeted-and-for-next-month-3-chromium-linux.png

...t-transfer-funds-to-another-category-1-chromium-linux.png

...t-transfer-funds-to-another-category-2-chromium-linux.png

...t-transfer-funds-to-another-category-3-chromium-linux.png

...s-cash-flow-graph-and-checks-visuals-1-chromium-linux.png

...s-cash-flow-graph-and-checks-visuals-2-chromium-linux.png

...s-cash-flow-graph-and-checks-visuals-3-chromium-linux.png

...oads-net-worth-and-cash-flow-reports-1-chromium-linux.png

...oads-net-worth-and-cash-flow-reports-2-chromium-linux.png