Fix downloaders

src/mangadex/downloader.cr

@@ -27,6 +27,7 @@ module MangaDex
 
     def pop : Queue::Job?
       job = nil
+      MainFiber.run do
         DB.open "sqlite3://#{@queue.path}" do |db|
           begin
             db.query_one "select * from queue where id not like '%-%' " \
@@ -37,6 +38,7 @@ module MangaDex
           rescue
           end
         end
+      end
       job
     end
 

src/plugin/downloader.cr

@@ -8,6 +8,7 @@ class Plugin
 
     def pop : Queue::Job?
       job = nil
+      MainFiber.run do
         DB.open "sqlite3://#{@queue.path}" do |db|
           begin
             db.query_one "select * from queue where id like '%-%' " \
@@ -18,6 +19,7 @@ class Plugin
           rescue
           end
         end
+      end
       job
     end