Rewatch - regression for relative path in ppx-flags

[DZakh]

I couldn't use a relative path for testing ppx locally:

Error while running external preprocessor
Command line: /Users/dzakh/code/DZakh/rescript-schema/packages/e2e/node_modules/e2e/../../../sury-ppx/bin '/var/folders/pv/vz3qt1p52g72mw05tb7gzgy00000gn/T/ppxeb515dPpx_General_test.resi' '/var/folders/pv/vz3qt1p52g72mw05tb7gzgy00000gn/T/ppx987ccdPpx_General_test.resi'

It now calls rescript-schema/packages/e2e/node_modules/e2e/../sury-ppx/bin
While before it was rescript-schema/packages/e2e/../sury-ppx/bin.

Changing to rescript-schema/packages/e2e/node_modules/e2e/../../../sury-ppx/bin didn't help, since rescript-schema/packages/e2e/node_modules/e2e doesn't exist and it can't perform ../../../ because of this.