Lux Artllery vs Bridges

[dwetuski]

Describe the bug 2-color artifact lands (e.g. Goldmire Bridge) don't let players choose colors when paying for artifact creatures with sunburst from Lux Artillery.

To Reproduce Steps to reproduce the behavior:

1. Play several Bridge lands.
2. Play Lux Artillery.
3. Choose to cast an artifact creature with a generic mana cost (e.g. Towashi Guide-Bot)
4. Manually click the Bridge lands to pay the cost.
5. The colors produced by these lands seem to be chosen arbitrarily resulting in an unpredictable number of +1/+1 counters..

Expected behavior 5. The player is prompted to choose which colors of mana to produce.

Desktop (please complete the following information): Forge v.1.6.62 (forge.GuiDesktop@6ddf90b0) Linux (6.1.52-valve16-1-neptune-61 amd64) Java Version - 1.8.0_401

Additional Context: Lands with abilities to choose from 3 colors (e.g. Jungle Shrine) have the same issue, but lands with choose any color abilities do not, despite using the same UI. Lands with multiple basic land types do not have this issue.