install dropins, rather than drop in

tests/org.eclipse.wtp.releng.tests/test.xml

diff --git a/tests/org.eclipse.wtp.releng.tests/test.xml b/tests/org.eclipse.wtp.releng.tests/test.xml
index f2081be..ad4a5b0 100644
--- a/tests/org.eclipse.wtp.releng.tests/test.xml
+++ b/tests/org.eclipse.wtp.releng.tests/test.xml
@@ -168,7 +168,7 @@
             todir="${buildDirectory}/${buildLabel}/"
             flatten="true">
             <fileset
-                dir="${testRoot}${dropinsFolder}/eclipse/plugins/">
+                dir="${testRoot}/eclipse/plugins/">
                 <include
                     name="**/org.eclipse.wtp.releng.tests*/*.xsl"/>
             </fileset>