cheatsheet.sh: Make CWD independent

[why]
Sometimes people like to call the scripts from any directory and do not
want to change into the bin/scripts/ directory first.

[how]
Just access the lib files relative to the cheatsheet script file.

Signed-off-by: Fini Jastrow <[email protected]>

Author: Finii

bin/scripts/cheatsheet.sh

@@ -5,8 +5,11 @@
 # Search for a glyph by part of its name in all patchsets
 # Usage: ./cheatsheet.sh divider
 
+# Get script directory to set source and target dirs relative to it
+sd="$( cd -- "$(dirname "${0}")" >/dev/null 2>&1 || exit ; pwd -P )"
+
 # shellcheck disable=SC1091 # Do not pull in the sourced file
-source ./lib/i_all.sh
+source "${sd}/lib/i_all.sh"
 
 # Search the key on the declared variables
 for glyph in ${!i_*}; do