Allow to force usage of plugin bridges

resources/ui/carla_settings.ui

@@ -887,9 +887,6 @@ You can disable these checks to get a faster scanning time (at your own risk).</
             </item>
             <item>
              <widget class="QCheckBox" name="ch_engine_prefer_plugin_bridges">
-              <property name="enabled">
-               <bool>false</bool>
-              </property>
               <property name="toolTip">
                <string>Whenever possible, run the plugins in bridge mode.</string>
               </property>

source/backend/plugin/BridgePlugin.cpp

@@ -1278,7 +1278,6 @@ public:
     {
         CARLA_ASSERT(kData->engine != nullptr);
         CARLA_ASSERT(kData->client == nullptr);
-        CARLA_ASSERT(filename != nullptr);
 
         // ---------------------------------------------------------------
         // first checks
@@ -1294,12 +1293,6 @@ public:
             return false;
         }
 
-        if (filename == nullptr)
-        {
-            kData->engine->setLastError("null filename");
-            return false;
-        }
-
         // ---------------------------------------------------------------
         // set info
 

source/bridges/CarlaBridgePlugin.cpp

@@ -545,9 +545,6 @@ int main(int argc, char* argv[])
         {
             client.sendOscUpdate();
             client.sendOscBridgeUpdate();
-
-            // test
-            carla_set_active(0, true);
         }
         else
         {