Clear Console after opening a new Sandbox in the same folder. (codesandbox#2660)

* Added clear-console in handleSandboxChange

* Clear console in handleSandboxChange

* Added some space

* Revert "Added clear-console in handleSandboxChange"

This reverts commit 95d3e96.

 	modified:   packages/common/src/components/Preview/index.tsx

* Dispatch Clear Console in handleSandboxChange

Author: niyabits

packages/common/src/components/Preview/index.tsx

@@ -243,6 +243,7 @@ class BasePreview extends React.Component<Props, State> {
     resetState();
 
     const url = this.currentUrl();
+    dispatch({ type: 'clear-console' });
 
     if (this.serverPreview) {
       setTimeout(() => {