[#367] Fixed `DisplayCAL.profile_loader.ProfileLoader._check_display_…

…changed()` to use the `REG_QWORD` value directly instead of trying to unpack it as the value is an `int` already.

DisplayCAL/profile_loader.py

@@ -26,7 +26,6 @@
     import ctypes
     import math
     import re
-    import struct
     import subprocess as sp
     import traceback
     import warnings
@@ -2466,9 +2465,9 @@ def _check_display_changed(self, first_run=False, dry_run=False):
             try:
                 display = winreg.QueryValueEx(subkey, "SetId")[0]
                 value_name = "Timestamp"
-                timestamp = struct.unpack(
-                    "<Q", winreg.QueryValueEx(subkey, "Timestamp")[0].rjust(8, "0")
-                )
+                # winreg.QueryValuesEx will directly return the int value,
+                # so no need to convert the binary data as in Python2
+                timestamp = winreg.QueryValueEx(subkey, "Timestamp")[0]
             except WindowsError as exception:
                 warnings.warn(
                     r"Registry access failed: %s: %s (HKLM\%s\%s)"