Fix warning

provider#androidx.work.impl.WorkManagerInitializer was tagged at AndroidManifest.xml:16 to remove other declarations but no other declaration present

matrix-sdk-android/src/androidTest/AndroidManifest.xml

@@ -0,0 +1,18 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="org.matrix.android.sdk">
+
+    <application>
+
+        <!--
+        This is mandatory to run integration tests
+        -->
+        <provider
+            android:name="androidx.work.impl.WorkManagerInitializer"
+            android:authorities="${applicationId}.workmanager-init"
+            android:exported="false"
+            tools:node="remove" />
+
+    </application>
+
+</manifest>

matrix-sdk-android/src/main/AndroidManifest.xml

@@ -10,15 +10,6 @@
 
     <application android:networkSecurityConfig="@xml/network_security_config">
 
-        <!--
-        This is mandatory to run integration tests
-        -->
-        <provider
-            android:name="androidx.work.impl.WorkManagerInitializer"
-            android:authorities="${applicationId}.workmanager-init"
-            android:exported="false"
-            tools:node="remove" />
-
         <!--
          The SDK offers a secured File provider to access downloaded files.
          Access to these file will be given via the FileService, with a temporary