fix: show actual error when command is not run in an app folder

[shazron]

Description

Right now, when you run an aio app command it prints out a Not a valid application root folder error if you are not in an app folder, but the actual error is not printed in a subsequent statement because a this.error call exits the app.

Add the actual exception error message to the error output as well.

Related: adobe/aio-cli#335

How Has This Been Tested?

1. mkdir foo
2. cd foo
3. aio app logs

$ aio app logs
 ›   Error: Not a valid application root folder
 ›   Please run 'aio app' commands from a folder generated by aio app init
 ›   package.json: ENOENT: no such file or directory, open 'package.json'

4. aio app logs --verbose

$ aio app logs --verbose
 ›   Error: Not a valid application root folder.
 ›   Please run 'aio app' commands from a folder generated by aio app init
 ›   Error: package.json: ENOENT: no such file or directory, open 'package.json'
 ›       at Object.openSync (fs.js:498:3)
 ›       at Object.readFileSync (fs.js:394:35)
 ›       at Object.readFileSync
 ›   (~/git/adobe/aio-cli-plugin-app/node_modules/jsonfile/index.js:50:22)
 ›       at loadCommonConfig (~/git/adobe/aio-cli-plugin-app/node_modules/@ad
 ›   obe/aio-cli-lib-app-config/src/index.js:138:26)
 ›       at loadConfig (~//git/adobe/aio-cli-plugin-app/node_modules/@adobe/ai
 ›   o-cli-lib-app-config/src/index.js:104:24)
 ›       at Logs.getFullConfig
 ›   (~/git/adobe/aio-cli-plugin-app/src/BaseCommand.js:134:24)
 ›       at Logs.run
 ›   (~/git/adobe/aio-cli-plugin-app/src/commands/app/logs.js:35:29)
 ›       at Logs._run (~/git/adobe/aio-cli-plugin-app/node_modules/@oclif/com
 ›   mand/lib/command.js:43:31)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #521 (eb65a5a) into master (a48e58d) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #521   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           50        50           
  Lines         2594      2594           
  Branches       469       469           
=========================================
  Hits          2594      2594           

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[purplecabbage]

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