nuspec: fix OxyPlot.UWP paths

Author: janusw

Source/OxyPlot.Xamarin.Forms.nuspec

@@ -57,7 +57,7 @@
     <file src="OxyPlot.Xamarin.Forms.Platform.MacOS\bin\Release\OxyPlot.Xamarin.Forms.Platform.Mac.???" target="lib/Xamarin.Mac20" />
     <file src="OxyPlot.Xamarin.Forms.Platform.MacOS\bin\Release\OxyPlot.Xamarin.Forms.???" target="lib/Xamarin.Mac20" />
 
-    <file src="OxyPlot.Windows\bin\Release\uap10.0\OxyPlot.Windows.???" target="lib/uap10.0" />
+    <file src="OxyPlot.UWP\bin\Release\uap10.0\OxyPlot.UWP.???" target="lib/uap10.0" />
     <file src="OxyPlot.Xamarin.Forms.Platform.UWP\bin\x64\Release\OxyPlot.Xamarin.Forms.Platform.UWP.???" target="lib/uap10.0" />
     <file src="OxyPlot.Xamarin.Forms.Platform.UWP\bin\x64\Release\OxyPlot.Xamarin.Forms.???" target="lib/uap10.0" />