Format public API type stubs

Author: Robolightning

av/error.pyi

@@ -13,7 +13,6 @@ class FFmpegError(Exception):
     def filename(self) -> str | None: ...
     @property
     def log(self) -> tuple[int, str, str] | None: ...
-
     def __init__(
         self,
         code: int,

av/filter/filter.pyi

@@ -9,7 +9,6 @@ class Filter:
     def inputs(self) -> tuple[FilterPad, ...]: ...
     @property
     def outputs(self) -> tuple[FilterPad, ...]: ...
-
     def __init__(self, name: str) -> None: ...
 
 filters_available: set[str]