Remove duplicate sln files.

Author: mo-esmp

samples/netcore2.0/DynamicRoleBasedAuthorization.sln

@@ -1,6 +1,6 @@
 {
   "ConnectionStrings": {
-    "DefaultConnection": "Server=localhost;Database=DynamicRoleBasedAuthorization;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "DefaultConnection": "Server=localhost;Database=DynamicRoleBasedAuthorization2;Trusted_Connection=True;MultipleActiveResultSets=true"
   },
   "Logging": {
     "IncludeScopes": false,