remove unused imports, shorten when construct

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/nextcloud/client/device/PowerManagementServiceImpl.kt

@@ -21,12 +21,10 @@
 
 package com.nextcloud.client.device
 
-import android.annotation.TargetApi
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.os.BatteryManager
-import android.os.Build
 import android.os.PowerManager
 import com.nextcloud.client.preferences.AppPreferences
 import com.nextcloud.client.preferences.AppPreferencesImpl
@@ -71,11 +69,10 @@ internal class PowerManagementServiceImpl(
         get() {
             val intent: Intent? = context.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
             val isCharging = intent?.let {
-                val plugged = it.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0)
-                when {
-                    plugged == BatteryManager.BATTERY_PLUGGED_USB -> true
-                    plugged == BatteryManager.BATTERY_PLUGGED_AC -> true
-                    plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS -> true
+                when (it.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0)) {
+                    BatteryManager.BATTERY_PLUGGED_USB -> true
+                    BatteryManager.BATTERY_PLUGGED_AC -> true
+                    BatteryManager.BATTERY_PLUGGED_WIRELESS -> true
                     else -> false
                 }
             } ?: false

src/main/java/com/owncloud/android/ui/activity/TextEditorWebView.kt

@@ -23,10 +23,8 @@ package com.owncloud.android.ui.activity
 
 import android.annotation.SuppressLint
 import android.net.Uri
-import android.os.Build
 import android.os.Bundle
 import android.widget.Toast
-import androidx.annotation.RequiresApi
 import com.nextcloud.client.appinfo.AppInfo
 import com.nextcloud.client.device.DeviceInfo
 import com.owncloud.android.R

src/test/java/com/nextcloud/client/device/TestPowerManagementService.kt

@@ -31,7 +31,6 @@ import com.nhaarman.mockitokotlin2.any
 import com.nhaarman.mockitokotlin2.anyOrNull
 import com.nhaarman.mockitokotlin2.eq
 import com.nhaarman.mockitokotlin2.mock
-import com.nhaarman.mockitokotlin2.never
 import com.nhaarman.mockitokotlin2.verify
 import com.nhaarman.mockitokotlin2.whenever
 import org.junit.Assert.assertEquals