dynamically add rules

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>

VDS/Components/TextFields/TextArea/TextArea.swift

@@ -111,6 +111,8 @@ open class TextArea: EntryFieldBase {
         }
         
         didSet {
+            setNeedsUpdate()
+            
             if textView.isFirstResponder {
                 validate()
             }
@@ -191,8 +193,9 @@ open class TextArea: EntryFieldBase {
         
     override func updateRules() {
         super.updateRules()
-        
-        rules.append(.init(countRule))
+        if let maxLength, maxLength > 0 {
+            rules.append(.init(countRule))
+        }
     }
     
     open override func getFieldContainer() -> UIView {