Mk/Uses/npm.mk: Always use X' for denoting BLOB data type

SQLite's .dump always uses X' (capital X) for BLOB. So it's better we
use X' in the code for securing reproducibility of node modules
tarball created by pnpm.

Also, conversion from x' to X' in output dump file in case x' is
accidentally mixed in.

Reported by: pkg-fallout