Repeat doesn't work with nearpc alias = u

[jetchirag]

Description

As @disconnect3d said on discord
pwndbg allows pressing enter after nearpc which repeats the command with next address but it doesn't work when you use aliases pdisass or u.

Steps to reproduce

1. Run nearpc $pc
2. Press enter to repeat it with last address, it works fine
3. Run u $pc
4. Press enter to repeat command, it doesn't work correctly

[disconnect3d]

As mentioned in #2096 we can't really unalias u, it is set by GDB to be an alias of the until command. For some reason however, GDB allows us to overwrite it as a command which we do here.

I think we should remove the u command overwrite at this point (so it gets back to until).

Also do people use nearpc? I usually use x/10i $pc instead. I also think that nearpc is not a great name and it would probably better to change it to disasm? Currently, disasm is a wrapper for pwntools command, ugh.

cc: @gsingh93 @CptGibbon @OBarronCS