Move setting of cperl-indent-level to .dir-locals.el

This removes duplication.

.dir-locals.el

@@ -1 +1,2 @@
-((cperl-mode . ((dumb-jump-force-searcher . rg))))
+((cperl-mode . ((dumb-jump-force-searcher . rg)
+                (cperl-indent-level . 4))))

bin/chkstow.in

@@ -123,6 +123,5 @@ sub list {
 
 # Local variables:
 # mode: perl
-# cperl-indent-level: 4
 # End:
 # vim: ft=perl

bin/stow.in

@@ -849,6 +849,5 @@ sub version {
 
 # Local variables:
 # mode: perl
-# cperl-indent-level: 4
 # end:
 # vim: ft=perl

lib/Stow.pm.in

@@ -2165,7 +2165,6 @@ EOF
 
 # Local variables:
 # mode: perl
-# cperl-indent-level: 4
 # end:
 # vim: ft=perl
 

lib/Stow/Util.pm.in

@@ -237,6 +237,5 @@ sub adjust_dotfile {
 
 # Local variables:
 # mode: perl
-# cperl-indent-level: 4
 # end:
 # vim: ft=perl

t/testutil.pm

@@ -313,6 +313,5 @@ sub is_nonexistent_path {
 
 # Local variables:
 # mode: perl
-# cperl-indent-level: 4
 # end:
 # vim: ft=perl