fix: read a typed folder and quit with 130

A folder typed in quotes at the BIOS folder question was used with its
quotes, and its missing parents were created without the question
--dest asks. The quotes go, ~ and variables expand on every system, and
a default folder that does not exist is named as such, not as found.
q at a menu now leaves with 130 like Ctrl+C, and Ctrl+C before anything
started no longer offers to carry on.

install.sh

@@ -18,7 +18,7 @@ esac
 TEMP_INSTALLER=""
 TEMP_DIRECTORY=""
 DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-DEFAULT_INSTALL_SHA256="81b72f480566791ccf1db34d20635bc7886190f2a21b150507c526130af1d499"
+DEFAULT_INSTALL_SHA256="1238dfb08b3168992cf4e390358540c6c1bbadf23ae5b74fb34e9101a2a083ef"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {