Refactor VboxMachine OS name handling to improve clarity

- Updated the VboxMachine class to conditionally append 'arm64' to the OS name based on the VM name, enhancing the clarity of OS identification.

Author: Nikolai Lambrov

frameworks/VboxMachine/VboxMachine.py

@@ -109,8 +109,10 @@ def os_name(self) -> str:
             os_type = self.vm.get_parameter('ostype')
             if os_type is None:
                 raise ValueError("OS type is not available")
+            self.__os_name = re.sub(r' \([^)]*bit\)', '', os_type).lower()
             prefix = 'arm64' if 'arm64' in self.vm.name.lower() else ''
-            self.__os_name = re.sub(r' \([^)]*bit\)', '', os_type).lower() + f' {prefix}' if prefix else ''
+            if prefix:
+                self.__os_name += f' {prefix}'
         return self.__os_name
 
     def run(self, headless: bool = True, status_bar: bool = False, timeout: int = 600):