[Python][CSV] Сannot remove columns with the same name from a table

### Describe the bug, including details regarding any error messages, version, and platform.

```
table = pyarrow.csv.read_csv(file)
table.drop_columns(table.column_names[3:])
```
I get an error:
```
KeyError: "Column 'san+francisco,ca_uvIndex' not found"
```
Actually, the table has such a column, even two (I don’t know why they have the same names, such a dataset). This works if you change one of the column names in the csv file.

### Component(s)

Python