[pacman] keep old packages for `auru`

The choice to remove these packages should be up to the administrator.
Having an old -git package around after experiencing an upstream issue
is always handy.

modules/pacman/helper_aur.zsh

@@ -4,7 +4,7 @@
 
 # download and build AUR package
 aurb() {
-  git clone https://aur.archlinux.org/${1}.git && cd ${1} && makepkg -sci 
+  git clone https://aur.archlinux.org/${1}.git && cd ${1} && makepkg --clean --install --syncdeps
 }
 
 # only download aur package; do not build
@@ -16,5 +16,5 @@ aurd() {
 #NOTE: this is will remove any unstashed/uncommitted changes.
 #      due to how makepkg will update the PKGBUILD, a git pull alone will not suffice.
 auru() {
-  git reset HEAD --hard && git pull && rm -f *.pkg.tar.xz || true && makepkg -sci
+  git reset HEAD --hard && git pull && makepkg --clean --force --install --syncdeps --cleanbuild
 }