Category count query fix

[JonasDov]

Closes #1360

[github-actions]

Tree-Widget benchmark

Benchmark suite	Current: ef0eb49	Previous: 352f29c	Deviation	Status
categories tree creates initial filtered view for 50k items	2418.66 ms	2362.32 ms	2.38%	〰️
categories tree creates initial filtered view for 50k items (P95 of main thread blocks)	1651 ms	1608 ms	2.67%	〰️
categories tree changing category visibility changes visibility for 50k subCategories	9413.26 ms	8791.66 ms	7.07%	〰️
categories tree changing category visibility changes visibility for 50k subCategories (P95 of main thread blocks)	3006 ms	2705 ms	11.13%	🚨
categories tree changing definition container visibility changes visibility for 50k categories	7131.15 ms	6116.68 ms	16.59%	🚨
categories tree changing definition container visibility changes visibility for 50k categories (P95 of main thread blocks)	4053 ms	2994 ms	35.37%	🚨
models tree creates initial filtered view for 50k target items	2310.68 ms	2128.03 ms	8.58%	〰️
models tree creates initial filtered view for 50k target items (P95 of main thread blocks)	328 ms	71 ms	361.97%	🚨
models tree changing model visibility changes visibility for 50k elements	49741.15 ms	45078.69 ms	10.34%	🚨
models tree changing model visibility changes visibility for 50k elements (P95 of main thread blocks)	277 ms	251 ms	10.36%	〰️
models tree changing category visibility changes visibility for 50k elements	51841.24 ms	44934.69 ms	15.37%	🚨
models tree changing category visibility changes visibility for 50k elements (P95 of main thread blocks)	270 ms	235 ms	14.89%	〰️
models tree changing per-model-category override changes visibility for 50k elements	51527.22 ms	44676.15 ms	15.33%	🚨
models tree changing per-model-category override changes visibility for 50k elements (P95 of main thread blocks)	267 ms	235 ms	13.62%	〰️
models tree changing element visibility changes only parent nodes visibility with 50k elements	52597.37 ms	45649.8 ms	15.22%	🚨
models tree changing element visibility changes only parent nodes visibility with 50k elements (P95 of main thread blocks)	498 ms	447 ms	11.41%	🚨

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