feat(legacy): trim overbooked shows after autoloading a playlist (#2897)

### Description

Some combination of preload/postload and autoloding playlists with
smartblocks generate massively overbooked shows that clutter up the
interface. This addition performs a 'trim overbooked' after filling up
the autoload list, and does the same as pushing the 'trim overbooked'
button in the UI.


### Testing Notes

Define an autoloading playlist of 2 hours and schedule it for a one hour
show. Without patch, you'll get entries for 2 hours, with the patch, you
only get one hour and a 'overboarding' orange entry at most.

---------

Co-authored-by: Kyle Robbertze <paddatrapper@users.noreply.github.com>
Co-authored-by: Thomas Göttgens <tgoettgens@mail.com>
Co-authored-by: jo <ljonas@riseup.net>

legacy/application/common/AutoPlaylistManager.php

@@ -81,6 +81,11 @@ class AutoPlaylistManager
                 $si->addPlaylistToShow($outroplaylistid, false);
             }
             $si->setAutoPlaylistBuilt(true);
+
+            // now trim excessively overbooked shows so the display isn't cluttered with myriads of red off-time blocks
+            if (Application_Model_Preference::getScheduleTrimOverbooked()) {
+                $si->trimOverbooked();
+            }
         }
         Application_Model_Preference::setAutoPlaylistPollLock(microtime(true));
     }