Scripts: fix NPE during accessing ScriptDependenciesCache

Getting value from SLRUMap needs write lock, because it can move value from one queue to another
EA-105195 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ScriptDependenciesCache.kt

@@ -163,11 +163,9 @@ private class ClearableLazyValue<in R, out T : Any>(
     private val compute: () -> T
 ) : ReadOnlyProperty<R, T> {
     override fun getValue(thisRef: R, property: KProperty<*>): T {
-        lock.read {
+        lock.write {
             if (value == null) {
-                lock.write {
+                value = compute()
-                    value = compute()
-                }
             }
             return value!!
         }