fix missing uniforms

src/mol-gl/shader/direct-volume.frag.ts

@@ -53,9 +53,12 @@ uniform int uGroupCount;
 #if defined(dColorMarker)
     uniform vec3 uHighlightColor;
     uniform vec3 uSelectColor;
+    uniform vec3 uDimColor;
     uniform float uHighlightStrength;
     uniform float uSelectStrength;
+    uniform float uDimStrength;
     uniform int uMarkerPriority;
+    uniform float uMarkerAverage;
 
     uniform float uMarker;
     uniform vec2 uMarkerTexDim;