Fix backspace behavior on mobile.

[tarehart]

From reading the code, I've inferred that the input box has a well-defined initial state that we always reset to: It has a value of "$", and the cursor is always at the end.

In cases where the cursor is NOT at the end as expected, we see two error cases:

• User enters a letter, the change handler fires with input like "a$", and "$" is incorrectly entered in the grid.
• User attempts to backspace, and the change handler does not fire at all because the cursor was at position 0 (Fixes #317)

I've developed and tested this fix using an android emulator attached to a chrome debug window.

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