And a few more crashes fixed in preferences

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralFragment.kt

@@ -79,7 +79,7 @@ class SettingsGeneralFragment : SettingsFragment(),
         if (p.key == getString(R.string.pref_library_columns_dialog_key)) {
             val fragment = LibraryColumnsDialog.newInstance(p)
             fragment.setTargetFragment(this, 0)
-            fragment.show(childFragmentManager, null)
+            fragment.show(fragmentManager, null)
             return true
         }
         return false

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsSourcesFragment.kt

@@ -73,7 +73,7 @@ class SettingsSourcesFragment : SettingsFragment() {
             setOnPreferenceClickListener {
                 val fragment = SourceLoginDialog.newInstance(source)
                 fragment.setTargetFragment(this@SettingsSourcesFragment, SOURCE_CHANGE_REQUEST)
-                fragment.show(childFragmentManager, null)
+                fragment.show(fragmentManager, null)
                 true
             }
 

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsSyncFragment.kt

@@ -42,7 +42,7 @@ class SettingsSyncFragment : SettingsFragment() {
                 setOnPreferenceClickListener {
                     val fragment = MangaSyncLoginDialog.newInstance(sync)
                     fragment.setTargetFragment(this@SettingsSyncFragment, SYNC_CHANGE_REQUEST)
-                    fragment.show(childFragmentManager, null)
+                    fragment.show(fragmentManager, null)
                     true
                 }
             }