fixes #977, blocks module name was incorrent in modifyblockposition

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Refs tickets  | -
| Fixed tickets | #977
| License       | MIT
| Doc PR        | -

The old blocks name was used instead of ZikulaBlocksModule