Fix duplicate phone number prefix 145 in zh_CN locale

[r266-tech]

Summary

The zh_CN phone number provider has a duplicate entry for prefix 145 in its phonenumber_prefixes list.

The Bug

The list contains 30 entries but only 29 unique prefixes - 145 appears twice. This means:

• Prefix 145 is generated approximately 2x more often than other prefixes
• The distribution is slightly skewed

The Fix

Remove the duplicate 145 entry from the list.

Before

phonenumber_prefixes = [
    ..., 156, 185, 186, 145, 133, 153, 180, 181, 189,
]
# 30 entries, 29 unique

After

phonenumber_prefixes = [
    ..., 156, 185, 186, 133, 153, 180, 181, 189,
]
# 29 entries, 29 unique

[fcurella]

Thank you!