Fix categories bug

When using the string type,
$typeid == 1 matched all strings making other conditions ineffective.

htdocs/categories/class/categorie.class.php

@@ -1123,11 +1123,11 @@ class Categorie
 		$cats = array();
 
 		$table=''; $type='';
-		if ($typeid == 0 || $typeid == 'product')         { $typeid=0; $table='product'; $type='product'; }
-		else if ($typeid == 1 || $typeid == 'supplier')  { $typeid=1; $table='societe'; $type='fournisseur'; }
-		else if ($typeid == 2 || $typeid == 'customer')  { $typeid=2; $table='societe'; $type='societe'; }
-		else if ($typeid == 3 || $typeid == 'member')    { $typeid=3; $table='member';  $type='member'; }
-        else if ($typeid == 4 || $typeid == 'contact')    { $typeid=4; $table='socpeople';  $type='contact'; }
+		if ($typeid === 0 || $typeid == 'product')         { $typeid=0; $table='product'; $type='product'; }
+		else if ($typeid === 1 || $typeid == 'supplier')  { $typeid=1; $table='societe'; $type='fournisseur'; }
+		else if ($typeid === 2 || $typeid == 'customer')  { $typeid=2; $table='societe'; $type='societe'; }
+		else if ($typeid === 3 || $typeid == 'member')    { $typeid=3; $table='member';  $type='member'; }
+        else if ($typeid === 4 || $typeid == 'contact')    { $typeid=4; $table='socpeople';  $type='contact'; }
 
 		$sql = "SELECT ct.fk_categorie, c.label";
 		$sql.= " FROM ".MAIN_DB_PREFIX."categorie_".$type." as ct, ".MAIN_DB_PREFIX."categorie as c";