Quote default variable assignment for SC2223

According to [SC2223](https://github.com/koalaman/shellcheck/wiki/SC2223), even default variable assignments following `:` need to be quoted. Just quote everything. Bash is bad.
Bash-it · Aug 15, 2021 · d88f4bb · d88f4bb
1 parent c6abccf
commit d88f4bb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/bash_it.sh b/bash_it.sh
@@ -108,7 +108,7 @@ done
 # Custom
 BASH_IT_LOG_PREFIX="core: main: "
 _log_debug "Loading general custom files..."
-: ${BASH_IT_CUSTOM:=${BASH_IT}/custom}
+: "${BASH_IT_CUSTOM:=${BASH_IT}/custom}"
 for _bash_it_config_file in "$BASH_IT_CUSTOM"/*.bash "$BASH_IT_CUSTOM"/**/*.bash
 do
 	if [ -e "${_bash_it_config_file}" ]; then