fix ffc cli option

bin/engines/ffc/config.json

@@ -1,5 +1,5 @@
 {
-    "abbr":"FSR",
+    "abbr":"ffc",
     "displayName":"FidelityFX_CLI",
     "lastUsedFilePath":"sc",
     "fileNameBeginning":"ig",
@@ -13,5 +13,5 @@
     "engineLink": "",
     "supports": [ "upscaling", "sharpening" ],
     "engineDownloadLink":"",
-    "filesToInclude": [ "fsr.py" ]
+    "filesToInclude": [ "ffc.py" ]
 }

smuL-cli.py

@@ -54,7 +54,9 @@ def performChecks ( args, ap ):
                 try:
                     engineInfo[ args.engine.lower() ]
                 except KeyError:
-                    print( '\n==> ERROR: Engine not available. Ensure you have specified a valid engine' )
+                    print( '\n==> ERROR: Engine not available. Ensure you have specified a valid engine. Possible engines: ' )
+                    for entry in engineList:
+                        print( '    --> ' + entry )
                     return False
                 
                 # Check scalefactor argument and also verify that engine supports upscaling