Fix searching items by itemtype

[vietlubu]

1. Cannot search item with itemtype is Healing

File: modules/item/index.php
With Healing items $itemType value is 0.
Is mean if ($itemType && $itemType !== '-1') allways false with Healing items selected.
We can use if ($itemType > -1). But I keep same style with checker $equipLocs line 103

@@ -55,7 +55,7 @@
			$bind[]      = $itemName;
		}
-		if ($itemType && $itemType !== '-1') {
+		if ($itemType !== false && $itemType !== '-1') {
			if (count($itemTypeSplit = explode('-', $itemType)) == 2) {

2. Cannot search item with itemtype is subtype

File: modules/item/index.php
Currently, FluxCP check view_sprite for subtype is incorrect.

@@ -72,10 +72,10 @@
				if (count($itemTypeSplit) == 2 && is_numeric($itemType2) && (floatval($itemType2) == intval($itemType2))) {
					$itemTypes2 = Flux::config('ItemTypes2')->toArray();
					if (array_key_exists($itemType, $itemTypes2) && array_key_exists($itemType2, $itemTypes2[$itemType]) && $itemTypes2[$itemType][$itemType2]) {
-						$sqlpartial .= "AND view_sprite = ? ";
+						$sqlpartial .= "AND subtype = ? ";
						$bind[]      = $itemType2;
					} else {
-						$sqlpartial .= 'AND view_sprite IS NULL ';
+						$sqlpartial .= 'AND subtype IS NULL ';
					}
				}

[danieldpl]

This PR looks correct and can be merged to improve the project.