build: properly inline multiple styles

[devversion]

• Recently we moved the inline script to the packaging directory and we cleaned up some logic. At this point the multiple style files inlining broke accidentally.
• We joined the different styles using a comma inside of the inlined stylesheet (while we were trying to create a array). Instead it would be just easier to concatenate the styles using a space.

Before (incorrect)

styleUrls: ["AAA,  BBB"] // Note the incorrect comma between the different stylesheets

Now (correct)

styleUrls: ["AAA BBB"] // This is a simpler solution than creating a real array and it also works the same

Fixes #4910

[jelbourn]

LGTM

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