tbel: fix bug validate decimal with <+>

common/script/script-api/src/main/java/org/thingsboard/script/api/tbel/TbUtils.java

@@ -1255,7 +1255,7 @@ public class TbUtils {
         if (str == null || str.isEmpty()) {
             return -1;
         }
-        return str.matches("-?\\d+(\\.\\d+)?") ? DEC_RADIX : -1;
+        return str.matches("[+-]?\\d+(\\.\\d+)?") ? DEC_RADIX : -1;
     }
 
     public static int isHexadecimal(String str) {

common/script/script-api/src/test/java/org/thingsboard/script/api/tbel/TbUtilsTest.java

@@ -213,6 +213,7 @@ public class TbUtilsTest {
 
         Assertions.assertEquals((Integer) 0, TbUtils.parseInt("0"));
         Assertions.assertEquals((Integer) 0, TbUtils.parseInt("-0"));
+        Assertions.assertEquals((Integer) 0, TbUtils.parseInt("+0"));
         Assertions.assertEquals(java.util.Optional.of(473).get(), TbUtils.parseInt("473"));
         Assertions.assertEquals(java.util.Optional.of(-255).get(), TbUtils.parseInt("-0xFF"));
         Assertions.assertThrows(NumberFormatException.class, () -> TbUtils.parseInt("-0xFF123"));