Mk/Uses/electron.mk: Secure reproducibility of node modules tarball in case of pnpmHEADmain

Formerly, node_modules directories produced by "pnpm install" were
used for node modules tarball. However, .modules.yaml file contained
in the tarball is not reliably reproducible and differs in some way
depending on the environment and/or timing where/when the tarball was
produced.

Instead of relying on node_modules directories, we use pnpm
store (produced by "pnpm fetch") for node modules tarball. We can use
the tarball later to install node modules into appropriate directories
using "pnpm install". Note that the timestamp "checkedAt" in each JSON
file in the pnpm store is reset to 0 to ensure reproducibility.

Reported by:	feld (via private email)
Tested by:	feld

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