remove packaging type from core

dmp-backend/core/pom.xml

@@ -6,7 +6,6 @@
 
     <artifactId>core</artifactId>
     <version>${revision}</version>
-    <packaging>${packaging.type}</packaging>
     
     <parent>
         <groupId>eu.eudat</groupId>
@@ -22,7 +21,6 @@
 		<maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <revision>1.0.0-SNAPSHOT</revision>
-        <packaging.type>jar</packaging.type>
     </properties>
     
     <dependencies>