Fix lag with many channels on main page

Disable loading all tabs at once, since there can be many of them, and use default strategy of only keeping in memory the two tabs adjacent to the current tab.

app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java

@@ -194,7 +194,6 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
         }
 
         binding.pager.setAdapter(null);
-        binding.pager.setOffscreenPageLimit(tabsList.size());
         binding.pager.setAdapter(pagerAdapter);
 
         updateTabsIconAndDescription();