Use 'depends_on' value for enablements checks only if its *dependency's* type is boolean

Previously, in dbdec061, we looked at the wrong field's type.
Also, fix non-boolean use of 'depends_on' in _sanitize_fiu of Settings.pm.

bin/FIJI/Settings.pm

@@ -723,7 +723,7 @@ sub _sanitize_fiu {
 sub _disabled_via_dependency {
     my ($map_ref, $consts_ref, $k) = @_;
     my $dependency = $map_ref->{$k}->{'depends_on'};
-    return defined($dependency) && !$consts_ref->{$dependency};
+    return defined($dependency) && $map_ref->{$k}->{'type'} eq 'boolean' && !$consts_ref->{$dependency};
 }
 
 sub _validate_hashmap {

bin/Tk/FIJISettingsViewer.pm

@@ -1609,12 +1609,15 @@ sub _validate_entry {
     my $logger = get_logger("");
     my ($self, $map, $widget, $name, $consts_ref, $new_ref, $diff, $old_str, $char_idx, $change_type) = @_;
 
+    # If the entry depends on another one there are two possibilities:
+    #  - if the dependency is of type boolean we regard it as an enable flag and may have to skip validation, or
+    #  - else $dep_ref is set accordingly to be available in validate_value() below if need be.
+    my $dep_name = $map->{$name}->{'depends_on'};
     my $dep_ref;
-
-    if (defined($map->{$name}->{'depends_on'})) {
-        $dep_ref = \$self->{'settings'}->{'design'}->{$map->{$name}->{'depends_on'}};
-        # don't validate if this entry is disabled
-        if ($map->{$name}->{'type'} eq 'boolean' and $$dep_ref == 0) {
+    if (defined($dep_name)) {
+        $dep_ref = \$self->{'settings'}->{'design'}->{$dep_name};
+        my $dep_type = DESIGNMAP->{$dep_name}->{'type'};
+        if ($dep_type eq 'boolean' and $$dep_ref == 0) {
             $logger->debug("Don't validate $name as it is disabled.");
             $self->_indicate_warning($widget, 0, $map, $name);
             return undef;