[Nuget] Remvoe fix dependency on MonoDroid70 (#798)

.nuspec/Xamarin.Forms.AppLinks.nuspec

@@ -17,6 +17,10 @@
         <dependency id="Xamarin.Android.Support.v4" version="[23.3.0]"/>
         <dependency id="Xamarin.GooglePlayServices.AppIndexing" version="[29.0.0.1]"/>
       </group>
+      <group targetFramework="MonoAndroid70">
+        <dependency id="Xamarin.Android.Support.v4" version="23.3.0"/>
+        <dependency id="Xamarin.GooglePlayServices.AppIndexing" version="29.0.0.1"/>
+      </group>
     </dependencies>
     <references>
       <group targetFramework="MonoAndroid10">