[Android] Fix Circle Stroke color is incorrectly updated as Fill color. (#33643)

<!-- Please let the below note in for people that find this PR -->
> [!NOTE]
> Are you waiting for the changes in this PR to be merged?
> It would be very helpful if you could [test the resulting
artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from
this PR and let us know in a comment if this change resolves your issue.
Thank you!
<!--
!!!!!!! MAIN IS THE ONLY ACTIVE BRANCH. MAKE SURE THIS PR IS TARGETING
MAIN. !!!!!!!
-->

### Description of Change

<!-- Enter description of the fix in this section -->
This pull request fixes a bug in the `CircleOnPropertyChanged` method of
the Android map handler where the circle's stroke color was incorrectly
applied to FillColor instead of StrokeColor.

Root Cause: A copy-paste error in `CircleOnPropertyChanged` caused the
Stroke paint to be assigned to nativeCircle.FillColor instead of
nativeCircle.StrokeColor. The sibling methods PolygonOnPropertyChanged
and PolylineOnPropertyChanged correctly set StrokeColor, but the circle
method had the wrong property name.

Fix: Changed the assignment from nativeCircle.FillColor to
nativeCircle.StrokeColor when mapping mauiCircle.Stroke to the native
circle, ensuring stroke and fill colors are applied to the correct
native properties.

Bug fix and code clarity improvements:

* Fixed assignment to set `nativeCircle.StrokeColor` (instead of
`FillColor`) from the `Stroke` property, ensuring the circle's stroke
color is updated correctly.
* Added braces and an explicit null check for `nativeCircle` to improve
code readability and prevent potential null reference errors.

### Issues Fixed

<!-- Please make sure that there is a bug logged for the issue being
fixed. The bug should describe the problem and how to reproduce it. -->

Fixes #33642

<!--
Are you targeting main? All PRs should target the main branch unless
otherwise noted.
-->

### Output
| Before | After |
|--|--|
| <video
src="https://github.com/user-attachments/assets/f3559741-e794-403c-a590-c9c871f25995">
|<video
src="https://github.com/user-attachments/assets/6174a836-082c-4ae8-9a93-09649b92f9b6">
|

Author: NirmalKumarYuvaraj

src/Core/maps/src/Handlers/Map/MapHandler.Android.cs

@@ -176,14 +176,19 @@ void CircleOnPropertyChanged(ICircleMapElement mauiCircle)
 			var nativeCircle = GetNativeCircle(mauiCircle);
 
 			if (nativeCircle == null)
+			{
 				return;
-
+			}
 
 			if (mauiCircle.Stroke is SolidPaint solidPaint)
-				nativeCircle.FillColor = solidPaint.Color.AsColor();
+			{
+				nativeCircle.StrokeColor = solidPaint.Color.AsColor();
+			}
 
 			if (mauiCircle.Fill is SolidPaint solidFillPaint)
+			{
 				nativeCircle.FillColor = solidFillPaint.Color.AsColor();
+			}
 
 			nativeCircle.Center = new LatLng(mauiCircle.Center.Latitude, mauiCircle.Center.Longitude);
 			nativeCircle.Radius = mauiCircle.Radius.Meters;