Make staging area for updatesite configurable

Change-Id: Iae35d1c68ace99e09b509139d0d490921467ef06
Signed-off-by: Arthur van Dorp <Arthur.vanDorp@bsi-software.com>
Reviewed-on: https://git.eclipse.org/r/c/scout/org.eclipse.scout.sdk/+/166818
(cherry picked from commit 2f39369ba95b78678fee4edd83cf06bfa26bb3ef)
Reviewed-on: https://git.eclipse.org/r/c/scout/org.eclipse.scout.sdk/+/166827
diff --git a/updatesite-maven-plugin/src/main/java/org/eclipse/scout/maven/plugins/updatesite/PublishMojo.java b/updatesite-maven-plugin/src/main/java/org/eclipse/scout/maven/plugins/updatesite/PublishMojo.java
index c5b4f26..04f6333 100644
--- a/updatesite-maven-plugin/src/main/java/org/eclipse/scout/maven/plugins/updatesite/PublishMojo.java
+++ b/updatesite-maven-plugin/src/main/java/org/eclipse/scout/maven/plugins/updatesite/PublishMojo.java
@@ -21,7 +21,7 @@
 @Mojo(name = "publish")
 public class PublishMojo extends AbstractStagingMojo {
 
-  @Parameter(expression="${updatesite.staging.area}" defaultValue = "/home/data/httpd/download.eclipse.org/scout/stagingArea")
+  @Parameter(expression = "${updatesite.staging.area}", defaultValue = "/home/data/httpd/download.eclipse.org/scout/stagingArea")
   private String stagingArea;
 
   @Override