Fix exception in imports folding when there're two imports lists (KT-29455)

Probably caused by modifications of the recovery for import lists
https://github.com/JetBrains/kotlin/commit/65e6e21d0f3017417ecb786a63d5209c546dd744

 #KT-29455 Fixed

idea/testData/folding/checkCollapse/doubleImportListsError.kt

@@ -0,0 +1,8 @@
+// An empty import list in PSI
+inline fun foo() {}
+
+// Another import list in PSI
+import a.foo
+import a.inlineOnly
+
+fun box(): String {}