Set fill as style, not attr when updating cells
Set fill as style, not attr when updating cells

Fix a bug when navigating between different campaigns in the
district dashboard that was caused by setting fill as an attribute
on cell update, but as a style on enter. Now we set it as a style
everywhere, and the cells update properly as you navigate between
campaigns.

https://seedscientific.atlassian.net/browse/POLIO-760

unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,unicef/polio,unicef/rhizome,unicef/rhizome,unicef/polio,SeedScientific/polio,SeedScientific/polio