Global basedirs flag uses wrong default value

The default value of the global `basedirs` flag (1) used the
`config.AppConfig.Snowblocks.Paths` array instead of
`config.AppConfig.Snowblocks.BaseDirs` that resulted in invalid paths
being processed by task runners and the configuration validators.

References:
  (1) https://github.com/arcticicestudio/snowsaw/blob/145a4c36caf960fc9a43b16c105df997e819a04d/cmd/snowsaw/snowsaw.go#L74

Epic: GH-33
Fixes GH-77

cmd/snowsaw/snowsaw.go

@@ -72,7 +72,7 @@ func init() {
 	rootCmd.PersistentFlags().StringVar(&explicitConfigFilePath, "config", "", "path to the configuration file")
 	rootCmd.PersistentFlags().BoolVar(&debug, "debug", false, "enable debug information output")
 	rootCmd.PersistentFlags().StringSliceVarP(
-		&snowblockBaseDirs, "basedirs", "b", config.AppConfig.Snowblocks.Paths,
+		&snowblockBaseDirs, "basedirs", "b", config.AppConfig.Snowblocks.BaseDirs,
 		"comma-separated paths to snowblock base directories")
 
 	// Set the app version information for the automatically generated `version` flag.