Fix on incorrect rejection by the regex of the size_str

String like '1. MB' should be accepted

Whatsapp_Chat_Exporter/utility.py

@@ -118,10 +118,10 @@ def readable_to_bytes(size_str: str) -> int:
         'YB': 1024**8
     }
     size_str = size_str.upper().strip()
-    match = re.fullmatch(r'^(\d+(\.\d+)?)\s*([KMGTPEZY]?B)?$', size_str)
     if size_str.isnumeric():
         # If the string is purely numeric, assume it's in bytes
         return int(size_str)
+    match = re.fullmatch(r'^(\d+(\.\d*)?)\s*([KMGTPEZY]?B)?$', size_str)
     if not match:
         raise ValueError("Invalid size format for size_str. Expected format like '10MB', '1024GB', or '512'.")
     unit = ''.join(filter(str.isalpha, size_str)).strip()