fix: syntax error

Author: line-o

expath-pkg.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <package xmlns="http://expath.org/ns/pkg" 
     name="http://existsolutions.com/apps/web-annotation-service" 
-    abbrev="web-annotation-service" version="4.0.0" spec="1.0">
+    abbrev="web-annotation-service" version="4.0.1" spec="1.0">
     <title>Web Annotation Protocol Server</title>
     <dependency package="http://www.functx.com"/>
 </package>

modules/annotations.xqm

@@ -255,7 +255,7 @@ function annotations:update-container-item ($item as map(*)) as map(*) {
     try {
         if (annotations:is-group-annotation($item) and not(annotations:has-targets($item)))
         then (
-            if (annotations:exists($item?id)
+            if (annotations:exists($item?id))
             then (
                 map {
                     "id": $item?id,