avoid module-types override shouldFetch

[wenerme]

fix #2427

[github-actions]

File size impact

Merging fix-2426 into main will impact 2 files in 2 groups.

browser (0/2)

No impact on files in browser group.

node (1/1)

File	raw	gzip	brotli	Event
dist/system-node.cjs	-318,244 (200,342)	-74,142 (51,084)	-40,329 (43,669)	modified
Total size impact	-318,244 (200,342)	-74,142 (51,084)	-40,329 (43,669)

extras (1/8)

File	raw	gzip	brotli	Event
dist/extras/module-types.min.js	+30 (2,853)	+14 (1,231)	+13 (1,081)	modified
Total size impact	+30 (2,853)	+14 (1,231)	+13 (1,081)

_{Generated by file size impact during size-impact#3111523246}

[guybedford]

Tests seem to be failing, but happy to land something like this once they are passing.

[wenerme]

unpkg is too slow to load, changed to jsdeliver