Fix typo (#374)

Co-authored-by: Rene van der Heijden <r.van.der.heijden@VDLETS.nl>

Author: renevanderheijden

src/main/java/jenkins/plugins/office365connector/model/adaptivecard/ColumnSet.java

@@ -10,14 +10,14 @@ public class ColumnSet implements AdaptiveCardElement {
     private final String type = "ColumnSet";
     private final List<Column> columns;
     @SuppressFBWarnings(value = "SS_SHOULD_BE_STATIC")
-    private final String witdth = "stretch";
+    private final String width = "stretch";
 
     public ColumnSet(final List<Column> items) {
         this.columns = items;
     }
 
-    public String getWitdth() {
-        return witdth;
+    public String getWidth() {
+        return width;
     }
 
     public List<Column> getColumns() {

src/test/resources/requests/adaptivecard-success.json

@@ -44,7 +44,7 @@
                 ]
               }
             ],
-            "witdth": "stretch"
+            "width": "stretch"
           },
           {
             "facts": [