Fixed KT-4437 Converter for java: do not generate assert with lambda for constant message

#KT-4437 Fixed

j2k/tests/testData/ast/assertStatement/withStringDetail.kt

@@ -1 +1 @@
-assert(true) { "string details" }
+assert(true, "string details")

j2k/tests/testData/ast/assertStatement/withStringDetail2.java

@@ -0,0 +1,2 @@
+//statement
+assert true : "string details:" + x;

j2k/tests/testData/ast/assertStatement/withStringDetail2.kt

@@ -0,0 +1 @@
+assert(true) { "string details:" + x }