Fixed wrong tab page when page exceeds max pages

src/main/java/com/raoulvdberge/refinedstorage/tile/grid/WirelessGrid.java

@@ -132,7 +132,7 @@ public class WirelessGrid implements IGrid {
 
     @Override
     public int getTabPage() {
-        return tabPage;
+        return Math.min(tabPage, getTotalTabPages());
     }
 
     @Override

src/main/java/com/raoulvdberge/refinedstorage/tile/grid/portable/PortableGrid.java

@@ -238,7 +238,7 @@ public class PortableGrid implements IGrid, IPortableGrid {
 
     @Override
     public int getTabPage() {
-        return tabPage;
+        return Math.min(tabPage, getTotalTabPages());
     }
 
     @Override

src/main/java/com/raoulvdberge/refinedstorage/tile/grid/portable/TilePortableGrid.java

@@ -309,7 +309,7 @@ public class TilePortableGrid extends TileBase implements IGrid, IPortableGrid,
 
     @Override
     public int getTabPage() {
-        return world.isRemote ? TAB_PAGE.getValue() : tabPage;
+        return world.isRemote ? TAB_PAGE.getValue() : Math.min(tabPage, getTotalTabPages());
     }
 
     @Override