Fixes for tests about mod

#KT-25217

libraries/stdlib/jvm/src/kotlin/util/BigDecimals.kt

@@ -43,7 +43,7 @@ public inline operator fun BigDecimal.div(other: BigDecimal): BigDecimal = this.
  * Enables the use of the `%` operator for [BigDecimal] instances.
  */
 @kotlin.internal.InlineOnly
-@Deprecated("Use rem(other) instead", ReplaceWith("rem(other)"), DeprecationLevel.WARNING)
+@Deprecated("Use rem(other) instead", ReplaceWith("rem(other)"), DeprecationLevel.ERROR)
 public inline operator fun BigDecimal.mod(other: BigDecimal): BigDecimal = this.remainder(other)
 
 /**

libraries/stdlib/jvm/test/numbers/BigNumbersTest.kt

@@ -72,7 +72,7 @@ class BigNumbersTest {
         assertEquals(BigDecimal("2"), BigDecimal("4") / a)
         assertEquals(BigDecimal("-2"), -a)
         assertEquals(BigDecimal("-2"), -a % b)
-        assertEquals(BigDecimal("-2"), (-a).mod(b))
+        assertEquals(BigDecimal("-2"), @Suppress("DEPRECATION_ERROR") (-a).mod(b))
         assertEquals(BigDecimal("-2"), (-a).rem(b))
 
         assertEquals(BigDecimal("3"), a.inc())