"To raw string literal" intention: fix false negative with string content starts with newline symbol \n

#KT-36369 Fixed

idea/src/org/jetbrains/kotlin/idea/intentions/ToRawStringLiteralIntention.kt

@@ -82,7 +82,7 @@ class ToRawStringLiteralIntention : SelfTargetingOffsetIndependentIntention<KtSt
     }
 
     private fun hasTrailingSpaces(text: String): Boolean {
-        var afterSpace = true
+        var afterSpace = false
         for (c in text) {
             if ((c == '\n' || c == '\r') && afterSpace) return true
             afterSpace = c == ' ' || c == '\t'

idea/testData/intentions/toRawStringLiteral/trailingSpace3.kt

@@ -1,2 +1 @@
-// IS_APPLICABLE: false
 val v = <caret>"\n Hello, world!"

idea/testData/intentions/toRawStringLiteral/trailingSpace3.kt.after

@@ -0,0 +1,2 @@
+val v = """
+ Hello, world!"""