read_config_paths: Don't validate entry IDs

Not strictly up-to spec, but also won't break anything
An invalid ID should never have an alias set, as `find_entry_paths` prunes them

I feel like this sort of user error isn't worth maintaining code to check for, as the config line plain not working feels obvious enough
It's also easier to comprehend when reading

xdg-terminal-exec

@@ -189,11 +189,7 @@ read_config_paths() {
 		# Let `read` trim leading/trailing whitespace from the IDs
 		while IFS=":$OIFS" read -r entry_id action_id; do
 			case $entry_id in
-			# Ignore comments
-			'#'*) ;;
-			# Catch directives first
-
-			# cache control
+			# Directives to toggle cache
 			/enable_cache)
 				debug "directive	$entry_id ${XTE_CACHE_ENABLED+'(ignored)'}"
 				CACHE_ENABLED=${XTE_CACHE_ENABLED-true}
@@ -202,20 +198,8 @@ read_config_paths() {
 				debug "directive	$entry_id ${XTE_CACHE_ENABLED+'(ignored)'}"
 				CACHE_ENABLED=${XTE_CACHE_ENABLED-false}
 				;;
-
-			# `[The extensionless entry filename] should be a valid D-Bus well-known name.`
-			# `a sequence of non-empty elements separated by dots (U+002E FULL STOP),
-			# none of which starts with a digit, and each of which contains only characters from the set [a-zA-Z0-9-_]`
-			# Stricter parts seem to be related only to reversed DNS notation but not common naming
-			# i.e. there is `2048-qt.desktop`.
-			# I do not know of any terminal that starts with a number, but it's valid.
-
-			# Catch and error on invalid entry ID
-			*[![:alnum:]_.-]*'.desktop' | '.desktop' | '')
-				error "Discarded invalid, possibly misspelled, entry ID '$entry_id'"
-				;;
-			# Catch valid entry ID
-			[[:alnum:]_]*'.desktop')
+			# Catch entry ID
+			[!#]*'.desktop')
 				READ_ENTRY_IDS=${READ_ENTRY_IDS:+${READ_ENTRY_IDS}${N}}$entry_id:$action_id
 				debug "$entry_id	: $action_id"
 				;;