Can't drag map when adding new polygon or marker

[daqst]

Version:

 @ryersonlibrary/web-components@0.4.2

I'm submitting a:

[X] bug report
[ ] feature request

Current behavior:
When adding a new polygon or marker, any attempt to click and drag to move the map has no effect.

Expected behavior:
Click and drag of the map should work, even when in the middle of adding a map element.

Steps to reproduce:

• Run npm start
• Load the MapEditor demo
• Click either add new Polygon or Marker
• Try to drag the map, it doesn't work.

Other information:
Review input handlers.