Update test about conversions, remove irrelevant case

compiler/testData/ir/irText/expressions/signedToUnsignedConversions.kt

@@ -50,5 +50,6 @@ fun test() {
 
     takeUBytes(IMPLICIT_INT, EXPLICIT_INT, 42u)
 
-    takeLong(IMPLICIT_INT)
+//    such kind of conversions (Int <-> Long) actually are not supported
+//    takeLong(IMPLICIT_INT)
 }

compiler/testData/ir/irText/expressions/signedToUnsignedConversions_test.fir.txt

@@ -101,5 +101,3 @@ FILE fqName:<root> fileName:/signedToUnsignedConversions_test.kt
         CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=null
         CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=null
         CONST Long type=kotlin.Long value=42
-      ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/takeLong]>#' type=IrErrorType
-        CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=null

compiler/testData/ir/irText/expressions/signedToUnsignedConversions_test.txt

@@ -122,6 +122,3 @@ FILE fqName:<root> fileName:/signedToUnsignedConversions_test.kt
           TYPE_OP type=kotlin.UByte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UByte
             CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
           CONST Byte type=kotlin.UByte value=42
-      CALL 'public final fun takeLong (l: kotlin.Long): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        l: TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-          CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY