[blockly] Fix oh_context_info block "as {type}" not working

[florian-h05]

Regression from #3376.
Also simplifies the generated code (the members of the event object are now JS strings).

[florian-h05]

@kaikreuzer @jsjames We should merge this PR in the code freeze as it fixes a critical blockly regression.

[relativeci]

#4084 Bundle Size — 12.55MiB (~-0.01%).

308e539(current) vs 798fa23 main#4083(baseline)

Warning

Bundle contains 2 duplicate packages – View duplicate packages

Bundle metrics   1 change

	Current #4084	Baseline #4083
Initial JS	1.52MiB	1.52MiB
Initial CSS	0B	0B
Cache Invalidation	7.05%	7.11%
Chunks	620	620
Assets	702	702
Modules	2437	2437
Duplicate Modules	0	0
Duplicate Code	0%	0%
Packages	130	130
Duplicate Packages	1	1

Bundle size by type   1 change 1 improvement

	Current #4084	Baseline #4083
JS	10.87MiB (~-0.01%)	10.87MiB
CSS	846.25KiB	846.25KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	45.73KiB	45.73KiB
Other	847B	847B

Bundle analysis report Branch florian-h05:blockly-contextual-r... Project dashboard

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[stefan-hoehn]

A pity we both overlooked the issue in the original PR. 😢
LGTM now.