Fix crash when entering avatar picker on kitkat.

app/src/main/java/org/thoughtcrime/securesms/avatar/picker/AvatarPickerFragment.kt

@@ -123,7 +123,7 @@ class AvatarPickerFragment : Fragment(R.layout.avatar_picker_fragment) {
         }
       )
     }
-    clearButton.setOnClickListener { viewModel.clear() }
+    clearButton.setOnClickListener { viewModel.clearAvatar() }
 
     setFragmentResultListener(TextAvatarCreationFragment.REQUEST_KEY_TEXT) { _, bundle ->
       val text = AvatarBundler.extractText(bundle)

app/src/main/java/org/thoughtcrime/securesms/avatar/picker/AvatarPickerViewModel.kt

@@ -32,7 +32,7 @@ sealed class AvatarPickerViewModel(private val repository: AvatarPickerRepositor
     }
   }
 
-  fun clear() {
+  fun clearAvatar() {
     store.update {
       val avatar = getDefaultAvatarFromRepository()
       it.copy(currentAvatar = avatar, canSave = true, canClear = false, isCleared = true)