Fix: Prevent full system upgrade in pkg.installed for Arch Linux

This change modifies the logic in the pacman module to only append the '-u' flag to the pacman command if sysupgrade is explicitly set to True. This prevents the pkg.installed state from triggering a full system upgrade by default on Arch Linux systems.

salt/modules/pacmanpkg.py

@@ -551,7 +551,7 @@ def install(name=None,
         cmd.append('-S')
         if refresh is True:
             cmd.append('-y')
-        if sysupgrade is True or (sysupgrade is None and refresh is True):
+        if sysupgrade is True:
             cmd.append('-u')
         cmd.extend(['--noprogressbar', '--noconfirm', '--needed'])
         wildcards = []