fix: compiling js/wasm/plan9/aix failed missing method ColorProfile

[mschneider82]

fixed compiling wasm

trying to compile the hello-world to wasm failed:

termenv/examples/hello-world>   GOOS=js GOARCH=wasm go build -o m main.go
../../termenv.go:41:16: output.ColorProfile undefined (type *Output has no field or method ColorProfile)
../../termenv.go:97:9: o.ColorProfile undefined (type *Output has no field or method ColorProfile)

also:
./main.go:10:33: undefined: termenv.EnableVirtualTerminalProcessing

after this PR:
it compiles...