Remove offsets_begin() call from nvtext::generate_ngrams (rapidsai#15077

)

Removes call to `strings_column_view::offsets_begin()` call from `nvtext::generate_ngrams()`.
A future PR will deprecate the `offsets_begin()` function which hardcodes to int32 type.

Authors:
  - David Wendt (https://github.com/davidwendt)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Mike Wilson (https://github.com/hyperbolic2346)

URL: rapidsai#15077

cpp/src/text/generate_ngrams.cu

@@ -103,11 +103,8 @@ std::unique_ptr<cudf::column> generate_ngrams(cudf::strings_column_view const& s
 
   // first create a new offsets vector removing nulls and empty strings from the input column
   std::unique_ptr<cudf::column> non_empty_offsets_column = [&] {
-    cudf::column_view offsets_view(cudf::data_type{cudf::type_id::INT32},
-                                   strings_count + 1,
-                                   strings.offsets_begin(),
-                                   nullptr,
-                                   0);
+    cudf::column_view offsets_view(
+      strings.offsets().type(), strings_count + 1, strings.offsets().head(), nullptr, 0);
     auto table_offsets = cudf::detail::copy_if(
                            cudf::table_view({offsets_view}),
                            [d_strings, strings_count] __device__(cudf::size_type idx) {