fix: vendor chunk categorization

[codepunkt]

when your product includes a . in the directory name, for example codepunkt.de, chunk matching for vendor modules doesn't work properly due to the module id being split at . and reading the second element of the resulting array, meaning to read the file extension, but instead reading an arbitrary part of the path after the . in the project (and/or other directory) name.

this fixes that by using lastIndexOf to correctly asses the extension.

Description 📖

This pull request fixes a bug

Background 📜

This was happening because finding out the extension when calculating the vendor chunks wasn't done properly

The Fix 🔨

By changing to lastIndexOf, this works.

Screenshots 📷

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[ElMassimo]

Thanks Christoph!