[cli] Change --prefix-filter to --prefix

Author: derrod

README.md

@@ -164,9 +164,7 @@ optional arguments:
                         debug
   --platform <Platform>
                         Platform override for download (disables install)
-  --prefix-filter <prefix>
-                        Only fetch files whose path starts with <prefix> (case
-                        insensitive)
+  --prefix <prefix>     Only fetch files whose path starts with <prefix> (case insensitive)
 
 
 Command: uninstall

legendary/cli.py

@@ -445,8 +445,8 @@ def main():
                                 help='Set download manager and worker processes\' loglevel to debug')
     install_parser.add_argument('--platform', dest='platform_override', action='store', metavar='<Platform>',
                                 type=str, help='Platform override for download (disables install)')
-    install_parser.add_argument('--prefix-filter', dest='file_prefix', action='store', metavar='<prefix>',
-                                type=str, help='Only fetch files whose path starts with <prefix> (case insensitive)')
+    install_parser.add_argument('--prefix', dest='file_prefix', action='store', metavar='<prefix>', type=str,
+                                help='Only fetch files whose path starts with <prefix> (case insensitive)')
 
     launch_parser.add_argument('--offline', dest='offline', action='store_true',
                                default=False, help='Skip login and launch game without online authentication')