Fixes on Reflector module

Replace shell commands with python functions, remove unused imports

src/modules/reflector/main.py

@@ -2,22 +2,23 @@
 # -*- coding: utf-8 -*-
 
 import subprocess
-import libcalamares
-from pathlib import Path
+import shutil
+import os
 
 
 def reflector_process():
 
-    BACKUP_MIRROLIST = "cp /etc/pacman.d/mirrorlist /etc/pacman.d/mirrorlist.bak"
-    RESTORE_MIRROLIST = "cp /etc/pacman.d/mirrorlist.bak /etc/pacman.d/mirrorlist"
-    FETCH_MIRRORS = "reflector --verbose --latest 10 --protocol https --download-timeout 25 --sort rate --save etc/pacman.d/mirrorlist"
+    MIRRORLIST = "/etc/pacman.d/mirrorlist"
+    MIRRORLIST_BACKUP = "/etc/pacman.d/mirrorlist.bak"
+    FETCH_MIRRORS = "reflector --verbose --latest 10 --protocol https --download-timeout 25 --sort rate --save /etc/pacman.d/mirrorlist"
 
-    subprocess.call(BACKUP_MIRROLIST.split(' '))
+    shutil.copyfile(MIRRORLIST, MIRRORLIST_BACKUP)
 
     try:
         subprocess.call(FETCH_MIRRORS.split(' '))
     except:
-        subprocess.call(RESTORE_MIRROLIST.split(' '))
+        os.remove(MIRRORLIST)
+        os.rename(MIRRORLIST_BACKUP, MIRRORLIST)
 
 
 def run():