fix(@schematics/angular): move browserslist even when no sourceRoot i…

[alan-agius4]

…s available

Using package manager: 'npm'
Collecting installed dependencies...
Found 36 dependencies.
    ** Executing migrations for package '@angular/cli' **
RENAME src/browserslist => /browserslist
UPDATE tslint.json (2800 bytes)
UPDATE package.json (1396 bytes)
UPDATE tsconfig.json (460 bytes)
UPDATE tsconfig.app.json (282 bytes)
UPDATE tsconfig.spec.json (256 bytes)

Fixes #14660

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