Fixes update site link for org.eclipse.wtp.releng.tools.feature

See #2931

Author: iloveeclipse

cje-production/buildproperties.txt

@@ -46,7 +46,7 @@ BASEBUILD_ID="R-4.35-202502280140"
 PREVIOUS_RELEASE_ID="R-4.35-202502280140"
 
 BUILDTOOLS_REPO="https://download.eclipse.org/eclipse/updates/buildtools/snapshots"
-WEBTOOLS_REPO="https://download.eclipse.org/webtools/downloads/drops/R3.37.0/R-3.37.0-20250303081219/repository/"
+WEBTOOLS_REPO="https://download.eclipse.org/webtools/downloads/drops/R3.37.0/R-3.37.0-20250303081219/repositoryunittests/"
 BASEBUILDER_DIR="tmp/org.eclipse.releng.basebuilder"
 ECLIPSE_RUN_REPO="https://download.eclipse.org/eclipse/updates/4.36-I-builds/"