Prioritize text on the clipboard over files

[turt2live]

Word on macOS apparently sends a bitmap, which is super unhelpful.

Windows:

{types: Array(3), files: FileList}
types: (3) ["text/plain", "text/html", "text/rtf"]
files: FileList {length: 0}
__proto__: Object

macOS:

[t3chguy]

I think this will cause a regression in a typical Linux screenshot app which puts a raw image in as text :'(

[t3chguy]

See #10795