fix(shiny-preset): Empty nav links don't get padding #3045

Job	Run time
routine / routine	7m 45s
website / pkgdown	7m 29s
R-CMD-check / setup	1m 37s
R-CMD-check / macOS-latest (4.4.2)	3m 3s
R-CMD-check / windows-latest (4.4.2)	4m 30s
R-CMD-check / ubuntu-latest (devel)	2m 47s
R-CMD-check / ubuntu-latest (4.4.2)	3m 48s
R-CMD-check / ubuntu-latest (4.3.3)	3m 38s
R-CMD-check / ubuntu-latest (4.2.3)	3m 46s
R-CMD-check / ubuntu-latest (4.1.3)	2m 58s
R-CMD-check / ubuntu-latest (4.0.5)	2m 59s
Deploy to shinyapps.io	0s
	44m 20s

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