Fix file system browser hang when enrolling MOK from disk #921

Job	Run time
f41 x64 build compile_commands.json	3m 1s
f41 x64 build	2m 5s
f41 aa64 cross-build	2m 34s
f40 x64 build	2m 27s
f40 aa64 cross-build	1m 56s
f39 x64 build	2m 7s
f41 arm cross-build	2m 1s
centos9 x64 build	1m 9s
f40 arm cross-build	1m 55s
centos8 x64 build	1m 13s
f39 ia32 build	2m 1s
f39 arm cross-build	2m 1s
centos8 ia32 build	1m 16s
f41 x64 cross-build	2m 5s
f40 x64 cross-build	1m 54s
f39 x64 cross-build	1m 55s
f41 ia32 cross-build	2m 2s
f40 ia32 cross-build	2m 23s
f39 ia32 cross-build	2m 9s
	38m 14s

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