fix(java): localize cur not to affect outside the function

Author: akinomyoga

completions/java

@@ -112,7 +112,7 @@ _comp_cmd_java__packages()
     ((${#sourcepath[@]})) || return 0
 
     # convert package syntax to path syntax
-    cur=${cur//.//}
+    local cur=${cur//.//}
     # parse each sourcepath element for packages
     for i in "${sourcepath[@]}"; do
         if [[ -d $i ]]; then