pipewire: remove WORKDIR from documentation

In case docs PACKAGECONFIG is enabled, do_package_qa task fails
due to some of the generated html files are referencing the ${WORKDIR}.

Delete it from these files.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-multimedia/recipes-multimedia/pipewire/pipewire_1.2.7.bb

@@ -391,3 +391,9 @@ FILES:gstreamer1.0-pipewire = " \
 "
 
 BBCLASSEXTEND = "native nativesdk"
+
+do_install:append() {
+  if ls ${D}${datadir}/doc/pipewire/html/dir_*html; then
+    sed -i "s,${WORKDIR},,g" ${D}${datadir}/doc/pipewire/html/dir_*html
+  fi
+}