[Java.Runtime.Environment] don't call PeekPeer() inside AddPeer()

Context: dotnet/android#10004

This breaks the "replaceable" logic otherwise.

Author: jonathanpeppers

src/Java.Runtime.Environment/Java.Interop/ManagedValueManager.cs

@@ -57,9 +57,6 @@ public override void AddPeer (IJavaPeerable value)
 			var r = value.PeerReference;
 			if (!r.IsValid)
 				throw new ObjectDisposedException (value.GetType ().FullName);
-			var o = PeekPeer (value.PeerReference);
-			if (o != null)
-				return;
 
 			if (r.Type != JniObjectReferenceType.Global) {
 				value.SetPeerReference (r.NewGlobalRef ());

src/Java.Runtime.Environment/Java.Interop/MonoRuntimeValueManager.cs

@@ -124,9 +124,6 @@ public override void AddPeer (IJavaPeerable value)
 			var r = value.PeerReference;
 			if (!r.IsValid)
 				throw new ObjectDisposedException (value.GetType ().FullName);
-			var o = PeekPeer (value.PeerReference);
-			if (o != null)
-				return;
 
 			if (r.Type != JniObjectReferenceType.Global) {
 				value.SetPeerReference (r.NewGlobalRef ());