[FIX][SHELL] Remove i3exit path in lock alias

Because i3exit is part of my path, I do not need to use the full path
from home. This is more robust when changing the path of my scripts
directory, as I did earlier.

shell/.aliases

@@ -2,7 +2,7 @@
 alias ureload='xrdb -merge ~/.Xresources'
 
 # Shortcut to script with configuration
-alias lock='~/scripts/i3exit lock'
+alias lock='i3exit lock'
 
 # Colorize output
 alias ls='ls -CF --color=auto'