KASM-4038 fix yaml processor to now pass a bool value for hw3d

unix/kasmvnc_defaults.yaml

@@ -5,6 +5,9 @@ desktop:
     height: 768
   allow_resize: true
   pixel_depth: 24
+  gpu:
+    hw3d: false
+    drinode: /dev/dri/renderD128
 
 network:
   protocol: http

unix/vncserver

@@ -2249,7 +2249,22 @@ sub DefineConfigToCLIConversion {
             name => "desktop.gpu.hw3d",
             type => KasmVNC::ConfigKey::BOOLEAN
           })
-        ]
+        ],
+        toStringSub => sub {
+          $self = shift;
+          my $value = $self->configValue();
+
+          switch($value) {
+            case 'true' {
+              $valuesStr = '-hw3d ';
+            }
+            case 'false' {
+              $valuesStr = ' ';
+            }
+          }
+
+          return $valuesStr;
+        }
     }),
     KasmVNC::CliOption->new({
         name => 'drinode',