[I/Y-Build] Unify index.template.php site for I and Y builds

The existing differences are not relevant and probably only due to
omitted synchronization.

Part of #2625

cje-production/mbscripts/mb300_gatherEclipseParts.sh

@@ -256,7 +256,6 @@ $JavaCMD -jar $LAUNCHER_JAR \
   -DpostingDirectory=$CJE_ROOT/$DROP_DIR \
   -DequinoxPostingDirectory=$BUILD_ROOT/$EQUINOX_DROP_DIR \
   -DpublishingContent=$ECLIPSE_BUILDER_DIR/eclipse/publishingFiles \
-  -DdropTemplateFileName=$ECLIPSE_BUILDER_DIR/eclipse/publishingFiles/templateFiles/index.template_$PATCH_OR_BRANCH_LABEL.php \
   -DindexFileName=index.php \
   -DeclipseStream=$STREAM \
   -Dbase.builder=$CJE_ROOT/$BASEBUILDER_DIR \

cje-production/mbscripts/mb310_gatherEquinoxParts.sh

@@ -83,7 +83,6 @@ ${JAVA_HOME}/bin/java -jar $LAUNCHER_JAR \
   -DpostingDirectory=$CJE_ROOT/$DROP_DIR/$BUILD_ID \
   -DequinoxPostingDirectory=$CJE_ROOT/$EQUINOX_DROP_DIR \
   -DeqpublishingContent=$ECLIPSE_BUILDER_DIR/equinox/publishingFiles \
-  -DdropTemplateFileName=$ECLIPSE_BUILDER_DIR/eclipse/publishingFiles/templateFiles/index.template_$PATCH_OR_BRANCH_LABEL.php \
   -DindexFileName=index.php \
   -DeclipseStream=$STREAM \
   -Dequinox.build.configs=$ECLIPSE_BUILDER_DIR/equinox/buildConfigs \

cje-production/scripts/genTestIndexes.xml

@@ -95,7 +95,6 @@
     <!-- These variables used to be defined here, but now are defined in 
          publish.xml generateIndex target based on $job
       indexFileName
-      dropTemplateFileName
       testManifestFileName
     -->