remove auto-confirm on distro dependencies

because if it says yes to everything, and the package
manager would otherwise ask whether you want to give
it your first born son, you are therefore agreeing to it.

so remove -y for safety

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/dependencies/ubuntu2004

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-pkg_add="apt-get -y install"
+pkg_add="apt-get install"
 pkglist=" \
 autoconf autogen automake autopoint autotools-dev bc binutils-arm-none-eabi \
 bison build-essential cmake curl device-tree-compiler doxygen e2fsprogs efitools \