Make sure nb_bitmap_char is initialized #1404

Job	Run time
Linter on C code	15s
Code coverage	5m 59s
Check misspellings	12s
Clone, build, test	4m 11s
Build and test the Speculos docker / Build Speculos Docker image	4m 53s
Build and test the Speculos docker / Build application using the reusable workflow / Check if app is based on Rust / Check if app is based on Rust	4s
Build and test the Speculos docker / Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanos)	53s
Build and test the Speculos docker / Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanox)	53s
Build and test the Speculos docker / Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanosp)	38s
Build and test the Speculos docker / Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (stax)	46s
Build and deploy Speculos Python Package	3m 31s
Build and Upload the Speculos docker	0s
Build and test the Speculos docker / Functional tests with Ragger (nanos)	1m 18s
Build and test the Speculos docker / Functional tests with Ragger (nanox)	1m 24s
Build and test the Speculos docker / Functional tests with Ragger (nanosp)	1m 23s
Build and test the Speculos docker / Functional tests with Ragger (stax)	2m 28s
	28m 48s

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