Only hide x-axis text, not the whole axis in the hover-line
Only hide x-axis text, not the whole axis in the hover-line

Select just text elements in the x-axis group for fading out in the
hover-line component, not the entire axis. Fading out the entire axis
removes the domain as well as the text.

https://seedscientific.atlassian.net/browse/POLIO-645

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