[browser] Set BROWSER environment variable correctly. Fixes JB#52900
[browser] Set BROWSER environment variable correctly. Fixes JB#52900

Signed-off-by: Tomi Leppänen <5c72ffe736be5009d7fd5b3f191ca04ec28863e0@jolla.com>

sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser