Before in order to create `deps.nodejs-patched` the `deps.gradle` would
also have to be downloaded in order to patch `build.gradle` files with
path to the Gradle dependencies in Nix store.
It turns out just replacting lines referencing `mavenCentral()`,
`google()`, and `jcenter()` in `repositories` block is enough to make
Gradle properly fetch dependencies from repo provided via the command
line `-Dmaven.repo.local='${deps.gradle}` option.
This should reduce the required size for shells that don't use Gradle.
Signed-off-by: Jakub Sokołowski <jakub@status.im>