Apply De Morgan's laws to non-negated binary expressions

So #KT-18460 Fixed

idea/testData/intentions/convertBinaryExpressionWithDemorgansLaw/inapplicableOperator.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: false
+// ERROR: Unresolved reference. None of the following candidates is applicable because of receiver type mismatch: <br>public operator fun String?.plus(other: Any?): String defined in kotlin
+fun foo(a: Boolean, b: Boolean) : Boolean {
+    return !<caret>(!a + b)
+}