Reverted AndroidX dependencies to AndroidSupport v4 again

-Alow low-level API targets to work with the plugin with the latest updates from 1.0 to 1.3.

Author: EricBatlle

UnitySpeechRecognizer/Assets/Plugins/SpeechRecognizer/Android/UnitySpeechRecognizer.aar

@@ -22,8 +22,9 @@ android {
 }
 
 dependencies {
+    implementation 'com.android.support:support-annotations:28.0.0'
+    implementation 'com.android.support:support-compat:28.0.0'
     compileOnly files('./libs/classes.jar') // Avoid redundant Unity Player in final application APK
-    implementation "androidx.core:core-ktx:1.3.1"
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

UnitySpeechRecognizer/Assets/Plugins/SpeechRecognizer/Android/libs/core-1.3.1.aar

@@ -9,6 +9,9 @@
 import android.speech.RecognitionListener;
 import android.speech.RecognizerIntent;
 import android.speech.SpeechRecognizer;
+import android.support.annotation.Nullable;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 import android.util.Log;
 
 import com.unity3d.player.UnityPlayer;
@@ -17,10 +20,6 @@
 import java.util.IllformedLocaleException;
 import java.util.Locale;
 
-import androidx.annotation.Nullable;
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
-
 /**
  * Created by Eric on 27/03/2020.
  */