install.pl: remove prototypes

install.pl

@@ -183,7 +183,7 @@ sub copy_filter {
     return;
 }
 
-sub print_printers() {
+sub print_printers {
     say "Available printers:";
     printf "%-14s | %-12s| %s\n", "Printer name", "Model", "Location";
     say "-" x 70;
@@ -194,7 +194,7 @@ sub print_printers() {
     return;
 }
 
-sub usage() {
+sub usage {
     say
       "Script for installing faculty printers on Linux via Samba print server.";
     say "Requires local CUPS server running and Samba client installed.";