[MSBuildDeviceIntegration] Fix duplicated test parameter (#7809)

The following test case is duplicated in `MSBuildDeviceIntegration.XASdkDeployTests (...)`:

    new object[] {
    	/* isRelease */      true,
    	/* xamarinForms */   false,
    	/* targetFramework*/ "net8.0-android",
    },

This was likely a c/p error and the correct `targetFramework` is `net7.0-android`.

tests/MSBuildDeviceIntegration/Tests/XASdkDeployTests.cs

@@ -43,7 +43,7 @@ namespace Xamarin.Android.Build.Tests
 			new object[] {
 				/* isRelease */      true,
 				/* xamarinForms */   false,
-				/* targetFramework*/ "net8.0-android",
+				/* targetFramework*/ "net7.0-android",
 			},
 			new object[] {
 				/* isRelease */      false,