Do not start import fixes in write action because pop-up is possible

I was not able to reproduce the issue. However, according the rules
quick-fixes working with pop-ups should not start in write action
#KT-28196 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/ImportFix.kt

@@ -125,7 +125,7 @@ internal abstract class ImportFixBase<T : KtExpression> protected constructor(
         }
     }
 
-    override fun startInWriteAction() = true
+    override fun startInWriteAction() = false
 
     fun isOutdated() = modificationCountOnCreate != PsiModificationTracker.SERVICE.getInstance(project).modificationCount