visx file generated in kie-tools doesn't work correctly.

To reproduce it, just try to generate a visx file from the current main version.

Most probably, the regression was introduced here https://github.com/kiegroup/kie-tools/pull/781/files#diff-ac36964fea2fe0987bfe18a7aeb1aabe7c24e8b46f37ba3fa81fbcb59dfb0b58R34.

The error stack trace :

[2022-02-16 15:27:31.433] [exthost] [error] Activating extension kie-group.vscode-extension-pack-kogito-kie-editors failed due to an error:
[2022-02-16 15:27:31.433] [exthost] [error] ReferenceError: window is not defined
    at /home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20660:72
    at step (/home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20620:23)
    at Object.next (/home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20601:53)
    at /home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20595:71
    at new Promise (<anonymous>)
    at /home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20591:12
    at activate (/home/yamer/IdeaProjects/kie-tools/packages/vscode-extension-pack-kogito-kie-editors/dist/extension/extension.js:20637:12)
    at Function._callActivateOptional (/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:98:16040)
    at Function._callActivate (/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:98:15704)
    at /usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:98:13528
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async Promise.all (index 0)

 Same issue spotted also here:

• https://github.com/kiegroup/kie-tools/pull/825#issuecomment-1042723467