Fixes: dotnet/android#10404

Context: 57f7bc8

Commit 57f7bc8 updated `generator` to "avoid non-blittable types"
in native callback methods, for which there were two non-blittables:

  * System.Boolean, which should be marshaled as a System.SByte, and
  * System.Char, which should be marshaled as a System.UInt16.

The problem is that this hit a codepath which was *not*
"for native callback methods": field bindings.

Consider [`android.widget.RelativeLayout.LayoutParams.alignWithParent`][0]:

	package android.widget;
	public /* partial */ class RelativeLayout {
	  public /* partial */ class LayoutParams {
	    public boolean alignWithParent;
	  }
	}

which is bound as [`RelativeLayout.LayoutParams.AlignWithParent`][1]:

	namespace Android.Widget;
	public partial class RelativeLayout {
	  public new partial class LayoutParams {
	    [Register]
	    public bool AlignWithParent {
	      get => _members.InstanceFields.GetBooleanValue ("alignWithParent.Z", this);
	      set {
	        _members.InstanceFields.SetValue("alignWithParent.Z", this, value ? (sbyte)1 : (sbyte)0);
	      }
	    }
	  }
	}

The problem is the property setter, which calls
`Java.Interop.JniPeerMembers.JniInstanceFields.SetValue(string, IJavaPeerable, sbyte)`.
Before 57f7bc8, it would instead call
`Java.Interop.JniPeerMembers.JniInstanceFields.SetValue(string, IJavaPeerable, bool)`,
but with 57f7bc8 there are now runtime crashes when boolean fields
are accessed, starting in .NET 10 Preview 2.

The following code fragment:

	var p = new RelativeLayout.LayoutParams (1, 2) {
	  AlignWithParent = true,
	};

crashes with:

	F droid_boolfiel: java_vm_ext.cc:542] JNI DETECTED ERROR IN APPLICATION: attempt to access field boolean android.widget.RelativeLayout$LayoutParams.alignWithParent of type boolean with the wrong type byte: 0x709385d8
	F droid_boolfiel: java_vm_ext.cc:542]     in call to SetByteField
	F droid_boolfiel: java_vm_ext.cc:542]     from void crc6463d68d2626be2acb.MainActivity.n_onCreate(android.os.Bundle)

Fix this by updating `generator` so that `BoundFieldAsProperty.cs`
uses the parameter as-is when `ISymbol.OnlyFormatOnMarshal`=true.

The binding for `RelativeLayout.LayoutParams.AlignWithParent` becomes:

	namespace Android.Widget;
	public partial class RelativeLayout {
	  public new partial class LayoutParams {
	    [Register]
	    public bool AlignWithParent {
	      get => _members.InstanceFields.GetBooleanValue ("alignWithParent.Z", this);
	      set {
	        _members.InstanceFields.SetValue("alignWithParent.Z", this, value);
	      }
	    }
	  }
	}

i.e. calling `JniPeerMembers.JniInstanceFields.SetValue(string, IJavaPeerable, bool)`.

[0]: https://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams#alignWithParent
[1]: https://learn.microsoft.com/en-us/dotnet/api/android.widget.relativelayout.layoutparams.alignwithparent?view=net-android-34.0