Force-unsuspend when starting webRequest listener

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/759

If for some reasons the launch code throws, uBO could
find itself in permanent suspend mode, thus preventing
web pages from loading in Firefox.

Though uBO should not have exceptions thrown during
it's initialization code, this commit will ensure
uBO complete its initialization process should it
ever happen for whatever reason.

platform/chromium/vapi-background.js

@@ -1227,9 +1227,13 @@ vAPI.Net = class {
             this.suspendDepth += 1;
         }
     }
-    unsuspend() {
+    unsuspend(all = false) {
         if ( this.suspendDepth === 0 ) { return; }
-        this.suspendDepth -= 1;
+        if ( all ) {
+            this.suspendDepth = 0;
+        } else {
+            this.suspendDepth -= 1;
+        }
         if ( this.suspendDepth !== 0 ) { return; }
         this.unsuspendAllRequests(this.suspendableListener);
     }

src/js/traffic.js

@@ -1070,7 +1070,7 @@ return {
                     [ 'blocking', 'requestBody' ]
                 );
             }
-            vAPI.net.unsuspend();
+            vAPI.net.unsuspend(true);
         };
     })(),