Change decman operations order

src/decman/app.py

@@ -158,14 +158,14 @@ class Core:
         if self.update_units:
             self._disable_units()
 
+        if self.update_files:
+            self._create_and_remove_files()
+
         if self.update_packages:
             self._remove_pkgs()
             self._upgrade_pkgs()
             self._install_pkgs()
 
-        if self.update_files:
-            self._create_and_remove_files()
-
         if self.update_units:
             self._enable_units()