fix(breadcrumb-ios): Handle non-string category in getCurrentScreen #1017

Job	Run time
diff_check / diff_check	7s
Build android dev no-frameworks	7m 2s
Build android production no-frameworks	9m 58s
Build ios dev no-frameworks	45m 49s
Build ios production no-frameworks	52m 51s
Build ios dev dynamic-frameworks	24m 35s
Build ios production dynamic-frameworks	1h 6m 50s
Build web	4m 24s
	3h 31m 36s

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