Avoid reading newline while reading history

gdbinit-gep.py

@@ -430,7 +430,7 @@ def load_history_strings(self) -> list[str]:
         strings = []
         if os.path.exists(self.filename):
             with open(self.filename) as f:
-                for string in reversed(f.readlines()):
+                for string in reversed(f.read().splitlines()):
                     if self.ignore_duplicates and string in strings:
                         continue
                     if string: