modules/zsh: use alias to hide GDB startup messages

GDB prints a hell of a lot of stuff when it's started by default:

> GNU gdb (GDB) 10.1
> Copyright (C) 2020 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> Type "show copying" and "show warranty" for details.
> This GDB was configured as "x86_64-unknown-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <https://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
>     <http://www.gnu.org/software/gdb/documentation/>.
>
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This is especially annoying when running with -tui, when it'll make
you page through this crap before you can use it (and if you do
e.g. -ex run, it won't actually start running the program until the
pager is finished).

There's no way to configure it not to do this, but fortunately it does
at least have a command line switch to turn it off.

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