优化：移除multidex

注：Android 5.0（api21）开始，默认支持multidex，不需要手动接入multidex

app/build.gradle

@@ -45,7 +45,6 @@ android {
         versionName version
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         project.ext.set("archivesBaseName", name + "_" + version)
-        multiDexEnabled true
 
         buildConfigField "String", "Cronet_Version", "\"$CronetVersion\""
         buildConfigField "String", "Cronet_Main_Version", "\"$CronetMainVersion\""
@@ -133,7 +132,6 @@ dependencies {
     testImplementation('junit:junit:4.13.2')
     androidTestImplementation('androidx.test:runner:1.5.2')
     androidTestImplementation('androidx.test.espresso:espresso-core:3.5.1')
-    implementation('androidx.multidex:multidex:2.0.1')
     //kotlin
     //noinspection GradleDependency,DifferentStdlibGradleVersion
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version")

app/src/main/java/io/legado/app/App.kt

@@ -1,12 +1,12 @@
 package io.legado.app
 
+import android.app.Application
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.content.Context
 import android.content.pm.ActivityInfo
 import android.content.res.Configuration
 import android.os.Build
-import androidx.multidex.MultiDexApplication
 import com.github.liuyueyi.quick.transfer.ChineseUtils
 import com.github.liuyueyi.quick.transfer.constants.TransType
 import com.jeremyliao.liveeventbus.LiveEventBus
@@ -33,7 +33,7 @@ import splitties.init.appCtx
 import splitties.systemservices.notificationManager
 import java.util.concurrent.TimeUnit
 
-class App : MultiDexApplication() {
+class App : Application() {
 
     private lateinit var oldConfig: Configuration