Don't request write action for RemoveUnusedFunctionParameterFix because it's based on refactoring (KT-12440)

Workaround for exception: Refactorings should not be started inside write action because they start progress inside and any read action from the progress task would cause the deadlock

 #KT-12440 Fixed

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

@@ -30,6 +30,8 @@ class RemoveUnusedFunctionParameterFix(parameter: KtParameter) : KotlinQuickFixA
 
     override fun getText() = "Remove parameter '${element.name}'"
 
+    override fun startInWriteAction(): Boolean = false
+
     override fun invoke(project: Project, editor: Editor?, file: KtFile) {
         val parameterDescriptor = element.resolveToDescriptor() as ValueParameterDescriptor
         ChangeFunctionSignatureFix.runRemoveParameter(parameterDescriptor, element)