[mv3] Fix conversion of filters with important option

Related issue:
uBlockOrigin/uBOL-home#266

src/js/static-net-filtering.js

@@ -769,10 +769,6 @@ class FilterImportant {
         return filterDataAlloc(args[0]);
     }
 
-    static dnrFromCompiled(args, rule) {
-        rule.priority = (rule.priority || 0) + 30;
-    }
-
     static keyFromArgs() {
     }
 
@@ -4463,13 +4459,17 @@ StaticNetFilteringEngine.prototype.dnrFromCompiled = function(op, context, ...ar
 
     const realms = new Map([
         [ BLOCK_REALM, { type: 'block', priority: 10 } ],
+        [ BLOCK_REALM | IMPORTANT_REALM, { type: 'block', priority: 40 } ],
         [ ALLOW_REALM, { type: 'allow', priority: 30 } ],
         [ REDIRECT_REALM, { type: 'redirect', priority: 11 } ],
+        [ REDIRECT_REALM | IMPORTANT_REALM, { type: 'redirect', priority: 41 } ],
         [ REMOVEPARAM_REALM, { type: 'removeparam', priority: 0 } ],
         [ CSP_REALM, { type: 'csp', priority: 0 } ],
         [ PERMISSIONS_REALM, { type: 'permissions', priority: 0 } ],
         [ URLTRANSFORM_REALM, { type: 'uritransform', priority: 0 } ],
         [ HEADERS_REALM, { type: 'block', priority: 10 } ],
+        [ HEADERS_REALM | ALLOW_REALM, { type: 'allow', priority: 30 } ],
+        [ HEADERS_REALM | IMPORTANT_REALM, { type: 'allow', priority: 40 } ],
         [ URLSKIP_REALM, { type: 'urlskip', priority: 0 } ],
     ]);
     const partyness = new Map([