Clean-up bash comletion #2747

Job	Run time
Extract crate metadata	4s
License checks	1m 30s
Ensure 'cargo fmt' has been run	12s
Documentation	1m 23s
Run tests with updated syntaxes and themes	7m 46s
Run tests with system wide configuration	3m 39s
Minimum supported rust version	2m 57s
aarch64-unknown-linux-gnu (ubuntu-20.04)	5m 26s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	6m 6s
arm-unknown-linux-musleabihf (ubuntu-20.04)	7m 41s
i686-pc-windows-msvc (windows-2019)	10m 31s
i686-unknown-linux-gnu (ubuntu-20.04)	6m 27s
i686-unknown-linux-musl (ubuntu-20.04)	4m 58s
x86_64-apple-darwin (macos-12)	6m 22s
x86_64-pc-windows-gnu (windows-2019)	12m 28s
x86_64-pc-windows-msvc (windows-2019)	8m 45s
x86_64-unknown-linux-gnu (ubuntu-20.04)	5m 54s
x86_64-unknown-linux-musl (ubuntu-20.04)	6m 33s
	1h 38m 42s

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