component/theia: Fix Debian 9 RPATH fix

We were trying to patchelf a file that apparently exists when Theia
is compiled on Debian 8, 10 and 11, but not on Debian 9.

component/theia/buildout.cfg

@@ -43,7 +43,7 @@ post-install =
   cd %(location)s/node_modules/keytar/build/Release
   ${patchelf:location}/bin/patchelf --set-rpath \
     ${libsecret:location}/lib:${gettext:location}/lib:${glib:location}/lib \
-    keytar.node obj.target/keytar.node
+    keytar.node
 
 [theia-wrapper]
 recipe = slapos.recipe.template:jinja2