fix: don't eagerly set ControlFlow::Exit (fix #8631)

[thomaseizinger]

As discussed at length in #8631, run_iteration is basically unusable currently because it busy-loops the current thread. This shouldn't be the case though because the underlying tao::Runtime allows suspending until an actual event from the OS is generated. However, once ControlFlow::Exit has been set, this remains sticky and cannot be unset.

Local testing on Windows confirms that removing this particular snippet fixes the busy-looping behaviour whilst retaining all other window-related functionality.

[github-actions]

Package Changes Through 92cd207

There are 7 changes which include tauri-cli with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with minor, tauri with minor, @tauri-apps/api with minor, @tauri-apps/cli with minor

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	2.2.0	2.3.0
tauri-utils	2.1.1	2.2.0
tauri-bundler	2.2.3	2.2.4
tauri-runtime	2.3.0	2.4.0
tauri-runtime-wry	2.3.0	2.4.0
tauri-codegen	2.0.4	2.0.5
tauri-macros	2.0.4	2.0.5
tauri-plugin	2.0.4	2.0.5
tauri-build	2.0.5	2.0.6
tauri	2.2.5	2.3.0
@tauri-apps/cli	2.2.7	2.3.0
tauri-cli	2.2.7	2.3.0

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[thomaseizinger]

Hmm, this might actually not fix things. I just realised that run_iteration now never returns.

[thomaseizinger]

Closing in favor of #12668.