Revert "ids-functions.pl: Check if the generated stored rulesfile of a provider"

This commit causes massive troubles in the downloader and therefore
needs to be reverted.

This reverts commit 577e330495.

config/cfgroot/ids-functions.pl

@@ -877,12 +877,6 @@ sub _get_dl_rulesfile($) {
 	# Generate the full filename and path for the stored rules file.
 	my $rulesfile = "$dl_rules_path/$dl_rulesfile_prefix-$provider$suffix";
 
-	# Check if the file exists.
-	unless (-f "$rulesfile") {
-		# Abort return - nothing.
-		return;
-	}
-
 	# Return the generated filename.
 	return $rulesfile;
 }