fix(core): fix child webviews on macOS and Windows treated as full webview window

[amrbashir]

closes #11452

[github-actions]

Package Changes Through 076c876

There are 9 changes which include tauri-utils with minor, tauri with minor, @tauri-apps/api with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-bundler with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri-macros with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.0.3	2.1.0
tauri-utils	2.0.2	2.1.0
tauri-bundler	2.0.4	2.1.0
tauri-runtime	2.1.1	2.2.0
tauri-runtime-wry	2.1.2	2.2.0
tauri-codegen	2.0.2	2.0.3
tauri-macros	2.0.2	2.0.3
tauri-plugin	2.0.2	2.0.3
tauri-build	2.0.2	2.0.3
tauri	2.0.6	2.1.0
@tauri-apps/cli	2.0.4	2.1.0
tauri-cli	2.0.4	2.1.0

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