Minor fix in "extension" regex

Author: joz-k

src/ios_backup_extractor.pl

@@ -52,7 +52,7 @@
     kError        => 2,
 };
 
-my $s_extension_regex = qr{\.$wanted_extensions$}i;
+my $s_extension_regex = qr{\.(?:$wanted_extensions)$}i;
 
 # define command line options
 my %cmd_options;