fix test file generation && don't switch to a File upon workspace loads

src/app/tabs/test-tab.js

@@ -173,7 +173,7 @@ module.exports = class TestTab extends ApiFactory {
           <br/>
           For more details, see
           How to test smart contracts guide in our documentation.
-          <div class="${css.generateTestFile} btn btn-primary m-1" onclick="${this.testTabLogic.generateTestFile(this)}">Generate test file</div>
+          <div class="${css.generateTestFile} btn btn-primary m-1" onclick="${this.testTabLogic.generateTestFile.bind(this.testTabLogic)}">Generate test file</div>
         </div>
         <div class="${css.tests}">          
           <div class="${css.buttons}">

src/app/ui/landing-page/workspace.js

@@ -21,7 +21,6 @@ export const defaultWorkspaces = (appManager) => {
         appManager.ensureActivated('run')
         appManager.ensureActivated('solidityStaticAnalysis')
         appManager.ensureActivated('solidityUnitTesting')
-        globalRegistry.get('filemanager').api.switchFile()
         globalRegistry.get('verticalicon').api.select('solidity')
       }, () => {}),
     new Workspace(
@@ -31,7 +30,6 @@ export const defaultWorkspaces = (appManager) => {
       () => {
         appManager.ensureActivated('vyper')
         appManager.ensureActivated('run')
-        globalRegistry.get('filemanager').api.switchFile()
         globalRegistry.get('verticalicon').api.select('vyper')
       }, () => {}),
     new Workspace('Debugger', 'Debug transactions with remix', false, () => {