Makefile: Remove `mvn release:perform` line

That command resulted in this error:

    [INFO] [ERROR] Failed to execute goal
    org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy
    (default-deploy) on project pdf-form-replace-font2: Deployment
    failed: repository element was not specified in the POM inside
    distributionManagement element or in
    -DaltDeploymentRepository=id::layout::url parameter -> [Help 1]

I had added `release:perform` because it's described as the second step
in releasing in this document:
https://maven.apache.org/maven-release/maven-release-plugin/usage.html

However, as explained in
https://maven.apache.org/maven-release/maven-release-plugin/usage/perform-release.html
, `release:perform` runs the `deploy` target, which doesn't make sense
for this project. It seems like we only need `release:prepare` to do a
Maven-driven release.

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