[.NET] Fix gradle builds for multiple ABIs

Include the needed .NET jar in the Godot templates so it's always available, then we don't need to include the jar from a .NET publish which could fail when exporting to multiple architectures because it would attempt to add the same jar for each architecture.

platform/android/java/app/build.gradle

@@ -70,10 +70,7 @@ dependencies {
     }
 
     // .NET dependencies
-    String jar = '../../../../modules/mono/thirdparty/libSystem.Security.Cryptography.Native.Android.jar'
-    if (file(jar).exists()) {
-        monoImplementation files(jar)
-    }
+    monoImplementation fileTree(dir: 'monoLibs', include: ['*.jar'])
 }
 
 android {