Prompt dialog logic change

[tforward]

For when the dialog "Select Option" appears make it so that if all values in the prompt are the same don't ask the user which one to use just put the common value in.

For example a prompt asking a user to "Select a feature for DIAMETER" where the diameter is 150 between all the features don't prompt the user just put the value in. If they are indeed different (150, 200) then prompt the user to select which one they want.

[MikeMillerGIS]

This was the behavior at one point, but request was to show the dialog. I can look at a way to hide the dialog when one