fix delpaths against nested slicing

cli/test.yaml

@@ -3175,13 +3175,14 @@
 - name: del function
   args:
     - -c
-    - 'del(.), del(empty), del((.foo,.bar,.baz) | .[2,3,0]), del(.foo[0], .bar[0], .foo, .baz.bar[0].x)'
+    - 'del(.), del(empty), del((.foo,.bar,.baz) | .[2,3,0]), del(.foo[0], .bar[0], .foo, .baz.bar[0].x), del(.foo[1:][:3][1:], .bar[:2][1:])'
   input: '{"foo": [0,1,2,3,4], "bar": [0,1]}'
   expected: |
     null
     {"bar":[0,1],"foo":[0,1,2,3,4]}
     {"bar":[1],"foo":[1,4]}
     {"bar":[1]}
+    {"bar":[0],"foo":[0,1,4]}
 
 - name: del function with slice
   args:

func.go

@@ -1271,6 +1271,21 @@ func updatePaths(v interface{}, path []interface{}, w interface{}, delpaths bool
 				if start >= end {
 					return uu, nil
 				}
+				if len(path) > 1 {
+					u, err := updatePaths(uu[start:end], path[1:], w, delpaths)
+					if err != nil {
+						return nil, err
+					}
+					switch us := u.(type) {
+					case []interface{}:
+						vs := make([]interface{}, len(uu))
+						copy(vs, uu)
+						copy(vs[start:end], us)
+						return vs, nil
+					default:
+						return nil, &expectedArrayError{u}
+					}
+				}
 				vs := make([]interface{}, len(uu))
 				copy(vs, uu)
 				for y := start; y < end; y++ {