Revert "NumberPickerFactory: Show and hide keyboard using InputMethodManager"

This reverts commit 6967def950. InputMethodManager method
does not work reliably on widgets. It also cannot reliably hide the keyboard.

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/NumberPickerFactory.kt

@@ -20,11 +20,12 @@
 package org.isoron.uhabits.activities.common.dialogs
 
 import android.content.*
+import androidx.appcompat.app.*
 import android.text.*
 import android.view.*
+import android.view.WindowManager.LayoutParams.*
 import android.view.inputmethod.*
 import android.widget.*
-import androidx.appcompat.app.*
 import org.isoron.androidbase.activities.*
 import org.isoron.androidbase.utils.*
 import org.isoron.uhabits.*
@@ -69,16 +70,14 @@ class NumberPickerFactory
                     val v = picker.value + 0.05 * picker2.value
                     callback.onNumberPicked(v)
                 }
+                .setOnDismissListener{
+                    callback.onNumberPickerDismissed()
+                }
                 .create()
 
         dialog.setOnShowListener {
             picker.getChildAt(0)?.requestFocus()
-            context.showKeyboard()
-        }
-
-        dialog.setOnDismissListener {
-            context.hideKeyboard()
-            callback.onNumberPickerDismissed()
+            dialog.window?.setSoftInputMode(SOFT_INPUT_STATE_ALWAYS_VISIBLE)
         }
 
         InterfaceUtils.setupEditorAction(picker, TextView.OnEditorActionListener { _, actionId, _ ->