Fix tests: "infix modifier required" and "operator modifier required" errors

idea/testData/intentions/branched/ifThenToDoubleBang/conditionInvalidBinaryExp.kt

@@ -1,7 +1,7 @@
 // WITH_RUNTIME
 // IS_APPLICABLE: false
 
-fun <T> T.compareTo(a: T): Int = 0
+operator fun <T> T.compareTo(a: T): Int = 0
 
 fun main(args: Array<String>) {
     val foo = null

idea/testData/intentions/branched/ifThenToElvis/conditionInvalidBinaryExp.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-fun <T> T.compareTo(a: T): Int = 0
+operator fun <T> T.compareTo(a: T): Int = 0
 
 fun main(args: Array<String>) {
     val foo = null

idea/testData/intentions/branched/ifThenToSafeAccess/conditionInvalidBinaryExp.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-fun <T> T.compareTo(a: T): Int = 0
+operator fun <T> T.compareTo(a: T): Int = 0
 
 fun main(args: Array<String>) {
     val foo = "foo"

idea/testData/intentions/branched/ifThenToSafeAccess/conditionNotBinaryExpr.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-fun String?.times(a: Int): Boolean = a == 0
+operator fun String?.times(a: Int): Boolean = a == 0
 
 fun main(args: Array<String>) {
     val foo: String = "foo"