refactor: Avoid creating unnecessary theme objects for precompiled checks #3032

Job	Run time
website / pkgdown	7m 41s
routine / routine	6m 48s
R-CMD-check / setup	1m 0s
R-CMD-check / macOS-latest (4.4.2)	3m 1s
R-CMD-check / windows-latest (4.4.2)	3m 48s
R-CMD-check / ubuntu-latest (devel)	3m 19s
R-CMD-check / ubuntu-latest (4.4.2)	2m 46s
R-CMD-check / ubuntu-latest (4.3.3)	2m 21s
R-CMD-check / ubuntu-latest (4.2.3)	2m 38s
R-CMD-check / ubuntu-latest (4.1.3)	2m 48s
R-CMD-check / ubuntu-latest (4.0.5)	2m 26s
Deploy to shinyapps.io	0s
	38m 36s

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