Remove unecessary checks for ! notation

src/pynxtools/dataconverter/readers/multi/reader.py

@@ -170,17 +170,14 @@ def parse_config_value(value: str) -> Tuple[str, Any]:
 
         """
         # Regex pattern to match @prefix:some_string
-        pattern = r"!?(@\w+)(?::(.*))?"
+        pattern = r"(@\w+)(?::(.*))?"
         prefixes = re.findall(pattern, value)
         if not prefixes:
             return ("", value)
         return prefixes[0]
 
     # Handle non-keyword values
     if not isinstance(value, str) or "@" not in str(value):
-        if isinstance(value, str):
-            # Handle "!" notation for required fields in optional groups
-            value = value.lstrip("!")
         new_entry_dict[key] = value
         return