Refactor remove_prefix_from_names function for improved readability

This PR refactors the remove_prefix_from_names function to improve code readability. Specifically, it replaces the usage of update with direct dictionary key assignment.

scripts/get_hashes_page.py

@@ -48,7 +48,7 @@ def generate_doc_file(cmp_version, contracts):
 
 def remove_prefix_from_names(contracts):
     for contract in contracts:
-        contract.update([("name", remove_prefix(contract['name'], 'openzeppelin_presets_'))])
+        contract['name'] = remove_prefix(contract['name'], 'openzeppelin_presets_')
     return contracts