Fix wrong tycho.scmUrls

They have been wrong since the merge of repos and lead to wrong scm urls
in bundles.

eclipse.platform.common/pom.xml

@@ -23,10 +23,6 @@
   <artifactId>eclipse.platform.common</artifactId>
   <packaging>pom</packaging>
 
-   <properties>
-     <tycho.scmUrl>scm:git:https://github.com/eclipse-platform/eclipse.platform.common.git</tycho.scmUrl>
-  </properties>
-
   <!--
     To build individual bundles, we specify a repository where to find parent pom,
     in case it is not in local maven cache already

eclipse.platform.releng/pom.xml

@@ -26,10 +26,6 @@
   <artifactId>eclipse.platform.releng</artifactId>
   <packaging>pom</packaging>
 
-  <properties>
-    <tycho.scmUrl>scm:git:https://github.com/eclipse-platform/eclipse.platform.releng.git</tycho.scmUrl>
-  </properties>
-
   <profiles>
     <profile>
       <id>build-individual-bundles</id>

pom.xml

@@ -20,6 +20,9 @@
   <artifactId>platform-aggregator</artifactId>
   <version>4.30.0-SNAPSHOT</version>
   <packaging>pom</packaging>
+  <properties>
+     <tycho.scmUrl>scm:git:https://github.com/eclipse-platform/eclipse.platform.releng.aggregator.git</tycho.scmUrl>
+  </properties>
   <pluginRepositories>
 	<pluginRepository>
 		<id>tycho-snapshots</id>