Use endswith() for more clarity

Author: Byron

Diff for: git/config.py

@@ -452,7 +452,7 @@ def _read(self, fp: Union[BufferedReader, IO[bytes]], fpname: str) -> None:
         e = None  # None, or an exception.
 
         def string_decode(v: str) -> str:
-            if v and v[-1] == "\\":
+            if v and v.endswith("\\"):
                 v = v[:-1]
             # END cut trailing escapes to prevent decode error