Fixed regression in DateSpinner

A change was made to spinners here: cfac9a6
that caused DateSpinner to have 32 days per month and December appeared twice.
This change is needed for Picker so it can't be reverted, but this workaround restores the functionality of old code that relies on DateSpinner.

CodenameOne/src/com/codename1/ui/spinner/Spinner.java

@@ -137,7 +137,7 @@ public static Spinner createDate(long min, long max, long currentValue, char sep
      * @deprecated use NumericSpinner
      */
     public static Spinner create(int min, int max, int currentValue, int step) {
-        Spinner s = new Spinner(new SpinnerNumberModel(min, max, currentValue, step), new SpinnerRenderer<Object>());
+        Spinner s = new Spinner(new SpinnerNumberModel(min, max, currentValue, step, 0), new SpinnerRenderer<Object>());
         s.setRenderingPrototype(new Integer(max * 10));
         return s;
     }

CodenameOne/src/com/codename1/ui/spinner/SpinnerNumberModel.java

@@ -44,6 +44,13 @@ class SpinnerNumberModel implements ListModel {
     private double step;
     boolean realValues;
 
+    /**
+     * The old DateSpinner relies on behavior that was broken in this commit:
+     * https://github.com/codenameone/CodenameOne/commit/cfac9a6a1bb15027b48a9b822e2f21eb2835d38e#diff-d12531ab4b0dd8bf1233a09f3c5e2b2b5634bff3c3cd2f357ad0a001e5f19bbf
+     * This is a workaround to preserve compatibility
+     */
+    private int maxOffset = 1;
+
     private boolean setSelectedIndexReentrantLock;
 
     void setValue(Object value) {
@@ -80,6 +87,14 @@ public SpinnerNumberModel(int min, int max, int currentValue, int step) {
         this.step = step;
     }
 
+    SpinnerNumberModel(int min, int max, int currentValue, int step, int maxOffset) {
+        this.max = max;
+        this.min = min;
+        this.currentValue = currentValue;
+        this.step = step;
+        this.maxOffset = maxOffset;
+    }
+
     /**
      * Indicates the range of the spinner
      *
@@ -111,7 +126,7 @@ public Object getItemAt(int index) {
      * {@inheritDoc}
      */
     public int getSize() {
-        return (int)((max - min) / step) + 1;
+        return (int)((max - min) / step) + maxOffset;
     }