vendor.mime.types: Revert accidental modification.

I had added some lines during verification of the base CL [1], but had
accidentally committed, uploaded and merged them. This CL reverts the
accidental addition.

[1] r.android.com/1136528 commit 8e1c1f4d

Bug: 142267887
Test: Treehugger
Change-Id: If9ef2a956c8862b7022137111e6c512455780fc6