CI: Add modgui spec to pluginval, needed for mini variant

Signed-off-by: falkTX <falktx@falktx.com>

.github/workflows/build.yml

@@ -1211,17 +1211,18 @@ jobs:
       - name: Validate LV2 ttl syntax
         run: |
           lv2_validate \
-              /usr/lib/lv2/mod.lv2/*.ttl \
               /usr/lib/lv2/kx-meta/*.ttl \
               /usr/lib/lv2/kx-control-input-port-change-request.lv2/*.ttl \
               /usr/lib/lv2/kx-programs.lv2/*.ttl \
+              /usr/lib/lv2/mod.lv2/*.ttl \
+              /usr/lib/lv2/modgui.lv2/*.ttl \
               ./bin/*.lv2/*.ttl
       - name: Validate LV2 metadata and binaries
         run: |
           export LV2_PATH=/tmp/lv2-path
           mkdir ${LV2_PATH}
           mv bin/CardinalFX.lv2 bin/CardinalSynth.lv2 ${LV2_PATH}
-          cp -r /usr/lib/lv2/{atom,buf-size,core,data-access,kx-control-input-port-change-request,kx-programs,instance-access,midi,mod,parameters,port-groups,port-props,options,patch,presets,resize-port,state,time,ui,units,urid,worker}.lv2 ${LV2_PATH}
+          cp -r /usr/lib/lv2/{atom,buf-size,core,data-access,kx-control-input-port-change-request,kx-programs,instance-access,midi,mod,modgui,parameters,port-groups,port-props,options,patch,presets,resize-port,state,time,ui,units,urid,worker}.lv2 ${LV2_PATH}
           xvfb-run lv2lint -s lv2_generate_ttl -l ld-linux-x86-64.so.2 -M nopack $(lv2ls)
       - name: Test LV2 plugin
         run: |