ui: Fix node_modules symlink and WASM output
ui: Fix node_modules symlink and WASM output

The node_modules symlink was too shallow:
../../ui/node_modules
Instead of:
../../../../ui/node_modules
for its new position in out/foo/obj/ui

The WASM was being copied into the wrong directory:
out/foo/obj/ui
instead of
out/foo/ui

Change-Id: I471e8a7426df3731520774c4dbcec7fbf9eb1c21
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto