Display: Fix processing screen not showing on nano devices #1075

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 49s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 52s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 45s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 1s
Unit test	2m 19s
Tests on mainnet (nanos)	28s
Tests with the Python library and legacy Bitcoin app	41s
Tests (nanos)	7m 42s
Tests on mainnet (nanox)	28s
Tests (nanox)	8m 26s
Tests on mainnet (nanosp)	28s
Tests with the JS library	1m 22s
Tests (nanosp)	8m 36s
Tests (stax)	49m 18s
Tests for rust client library	1m 35s
Tests on mainnet (stax)	27s
	1h 29m 17s

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