Fix overloaded static methods on instances

[ilevkivskyi]

Fixes #7781

The fix is trivial. I guess this case was overlooked because someone thought static methods are all Decorators, well not always ;-)

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

rotki (https://github.com/rotki/rotki)
+ rotkehlchen/globaldb/handler.py:1345: error: Unused "type: ignore" comment
+ rotkehlchen/globaldb/handler.py:1358: error: "Dict[str, Any]" has no attribute "asset_type"
+ rotkehlchen/globaldb/handler.py:1360: error: "Dict[str, Any]" has no attribute "asset_type"
+ rotkehlchen/globaldb/handler.py:1365: error: "Dict[str, Any]" has no attribute "swapped_for"
+ rotkehlchen/globaldb/handler.py:1366: error: "Dict[str, Any]" has no attribute "name"
+ rotkehlchen/globaldb/handler.py:1367: error: "Dict[str, Any]" has no attribute "symbol"
+ rotkehlchen/globaldb/handler.py:1368: error: "Dict[str, Any]" has no attribute "started"
+ rotkehlchen/globaldb/handler.py:1370: error: "Dict[str, Any]" has no attribute "cryptocompare"
+ rotkehlchen/globaldb/handler.py:1371: error: "Dict[str, Any]" has no attribute "coingecko"
+ rotkehlchen/globaldb/handler.py:1372: error: "Dict[str, Any]" has no attribute "ethereum_address"
+ rotkehlchen/globaldb/handler.py:1373: error: "Dict[str, Any]" has no attribute "decimals"
+ rotkehlchen/globaldb/handler.py:1374: error: "Dict[str, Any]" has no attribute "protocol"
+ rotkehlchen/globaldb/handler.py:1378: error: "Dict[str, Any]" has no attribute "asset_type"
+ rotkehlchen/globaldb/handler.py:1380: error: "Dict[str, Any]" has no attribute "asset_type"
+ rotkehlchen/globaldb/handler.py:1385: error: "Dict[str, Any]" has no attribute "swapped_for"
+ rotkehlchen/globaldb/handler.py:1386: error: "Dict[str, Any]" has no attribute "forked"
+ rotkehlchen/globaldb/handler.py:1387: error: "Dict[str, Any]" has no attribute "name"
+ rotkehlchen/globaldb/handler.py:1388: error: "Dict[str, Any]" has no attribute "symbol"
+ rotkehlchen/globaldb/handler.py:1389: error: "Dict[str, Any]" has no attribute "asset_type"
+ rotkehlchen/globaldb/handler.py:1390: error: "Dict[str, Any]" has no attribute "started"
+ rotkehlchen/globaldb/handler.py:1393: error: "Dict[str, Any]" has no attribute "cryptocompare"
+ rotkehlchen/globaldb/handler.py:1394: error: "Dict[str, Any]" has no attribute "coingecko"
+ rotkehlchen/icons.py:155: error: Unused "type: ignore" comment
+ rotkehlchen/api/rest.py:1320: error: Unused "type: ignore" comment

[ilevkivskyi]

The mypy_primer errors are correct. Previously the type was Any, but now an actual return type is used, but the type is incorrect.