Remove legend title for state weekly reports

Starting on February 15, 2022 the legend title for the figure of cases by county started to show legend title.  This results in squishing the figure.  How do we get rid of the legend title? 

Code used to generate report: [parent](https://github.com/reichlab/covid19-forecast-hub/blob/master/code/reports/all-states-weekly-report.Rmd) [child](https://github.com/reichlab/covid19-forecast-hub/blob/master/code/reports/all-states-weekly-county_code.Rmd) 

CT: 2/15/22
![image](https://user-images.githubusercontent.com/66443989/155231076-a70be6be-0599-472c-ba79-a04ea61b4f23.png)

 
CT: 2/8/22
![image](https://user-images.githubusercontent.com/66443989/155230735-6212d88d-f584-4d18-b6ea-624ad3b6e212.png)



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Remove legend title for state weekly reports #6191

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Remove legend title for state weekly reports #6191

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