Simple solution to enable absolute paths in tsconfig

[gmhispagnol]

Absolute paths in tsconfig are used to make aliases to external folders, but tsconfig-paths always try to make paths absolute even when they already are. Simple fix:

mapping-entry.ts
getAbsoluteMappingEntries(){
...
return path.isAbsolute(pathToResolve) ? pathToResolve : path.join(absoluteBaseUrl, pathToResolve);
}