Tweak behavior on Browse screen (#8121)

* Tweak behavior on Browse screen

- Fix system back popping controller
- Add behavior to system back to cancel search toolbar before clearing current search or popping controller

* Review changes

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -5,7 +5,6 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import androidx.activity.OnBackPressedDispatcherOwner
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.SnackbarResult
@@ -196,17 +195,6 @@ class MangaController : FullComposeController<MangaPresenter> {
         }
     }
 
-    // Let Compose view handle this
-    override fun handleBack(): Boolean {
-        val dispatcher = (activity as? OnBackPressedDispatcherOwner)?.onBackPressedDispatcher ?: return false
-        return if (dispatcher.hasEnabledCallbacks()) {
-            dispatcher.onBackPressed()
-            true
-        } else {
-            false
-        }
-    }
-
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup, savedViewState: Bundle?): View {
         settingsSheet = ChaptersSettingsSheet(router, presenter)
         trackSheet = TrackSheet(this, (activity as MainActivity).supportFragmentManager)