Fix links in the published POM file

[jmini]

The published POM file on maven central:
https://repo1.maven.org/maven2/com/tokbox/opentok-server-sdk/4.15.0/opentok-server-sdk-4.15.0.pom

Contains links like:

<url>https://github.com/opentok/opentok-server-sdk</url>

<license>
  <name>MIT License</name>
  <url>https://raw.github.com/opentok/opentok-server-sdk/main/LICENCE.txt</url>
</license>

<scm>
   <connection>scm:[email protected]/opentok/opentok-server-sdk</connection>
   <developerConnection>scm:[email protected]/opentok/opentok-server-sdk</developerConnection>
   <url>https://github.com/opentok/opentok-server-sdk</url>
</scm>

Those links are broken.

They were correct in the POM of version 4.14.0:
https://repo1.maven.org/maven2/com/tokbox/opentok-server-sdk/4.14.0/opentok-server-sdk-4.14.0.pom

The problematic change was introduced by #255

With this PR I suggest to revert the change to the problematic line.

[SMadani]

Hi @jmini, thank you for reporting this and providing the fix!