ScheduledTootActivity: fix toolbar back button #1586 (#1591)

app/src/main/java/com/keylesspalace/tusky/ScheduledTootActivity.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.View
+import android.view.MenuItem
 import androidx.appcompat.widget.Toolbar
 import androidx.lifecycle.Lifecycle
 import androidx.recyclerview.widget.DividerItemDecoration
@@ -80,6 +81,16 @@ class ScheduledTootActivity : BaseActivity(), ScheduledTootAdapter.ScheduledToot
                 }
     }
 
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            android.R.id.home -> {
+                onBackPressed()
+                return true
+            }
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
     fun loadStatuses() {
         progress_bar.visibility = View.VISIBLE
         mastodonApi.scheduledStatuses()