C2LC-521: Change the row character positioning field to a single digit number input

Description

Right now the column text field only allows for 1 char of input but the row allows for 2. We only have 8 rows so should never require more than 1 char to represent the row.

Issue Links

• Related to C2LC-556: On Chromebook, character position controller row and column text input field is too wide, taking more spaces for scene to render