6882917: Nimbus and DefaultTableCellRenderer: must start with normal background

Reviewed-by: rupashka

src/share/classes/javax/swing/plaf/synth/SynthTableUI.java

@@ -638,7 +638,7 @@ class SynthTableUI extends BasicTableUI implements SynthUI,
             if ((b == null || b instanceof UIResource
                     || component instanceof SynthBooleanTableCellRenderer)
                     && !table.isCellSelected(row, column)) {
-                if (alternateColor != null && row % 2 == 0) {
+                if (alternateColor != null && row % 2 != 0) {
                     component.setBackground(alternateColor);
                 }
             }

src/share/classes/javax/swing/table/DefaultTableCellRenderer.java

@@ -214,8 +214,9 @@ public class DefaultTableCellRenderer extends JLabel
                                     : table.getBackground();
             if (background == null || background instanceof javax.swing.plaf.UIResource) {
                 Color alternateColor = DefaultLookup.getColor(this, ui, "Table.alternateRowColor");
-                if (alternateColor != null && row % 2 == 0)
+                if (alternateColor != null && row % 2 != 0) {
                     background = alternateColor;
+                }
             }
             super.setForeground(unselectedForeground != null
                                     ? unselectedForeground