Fix classpath "update" to be a classpath "recalculation" instead

ClasspathComputer is broken and cannot cope with JAR files anymore

Request: W5P-36514
Change-Id: I896828b979683cda042fa1892ee31c48c2263900
diff --git a/org.eclipse.tea.library.build/src/org/eclipse/tea/library/build/util/ClasspathUpdater.java b/org.eclipse.tea.library.build/src/org/eclipse/tea/library/build/util/ClasspathUpdater.java
index 3a4503e..80834f6 100644
--- a/org.eclipse.tea.library.build/src/org/eclipse/tea/library/build/util/ClasspathUpdater.java
+++ b/org.eclipse.tea.library.build/src/org/eclipse/tea/library/build/util/ClasspathUpdater.java
@@ -87,7 +87,7 @@
 					continue;
 				}
 
-				IClasspathEntry[] entries = ClasspathComputer.getClasspath(project, model, null, false, true);
+				IClasspathEntry[] entries = ClasspathComputer.getClasspath(project, model, null, true, true);
 
 				// add source attachments where possible. PDE cannot do it,
 				// because of reasons... :(