[tt-train] Adjust tests due to positional embedding changes (#15793)

### Problem description
Tests for tt-train is currently broken.

### What's changed
Adjust test value due to changes in previous PR. 

### Checklist
- [x] Post commit CI passes
- [x] New/Existing tests provide coverage for changes

tt-train/tests/model/nano_gpt_test.cpp

@@ -168,9 +168,9 @@ void train_test(bool use_moreh_adamw = false) {
     // verify program cache
     auto program_cache_entries = device->num_program_cache_entries();
     if (!use_moreh_adamw) {
-        EXPECT_EQ(program_cache_entries, 124);
+        EXPECT_EQ(program_cache_entries, 123);
     } else {
-        EXPECT_EQ(program_cache_entries, 103);
+        EXPECT_EQ(program_cache_entries, 102);
     }
 
     // verify time per step