White buttons for close folderView and for titleBar (all themes)

[conema]

New view for monterail-dark-fulldark:

Light view is changed in #94

[conema]

There is a bug with the folder close icon (.close-icon) in linux because the icon set used is different from windows.
This resolve the issue for me (openSUSE - KDE Plasma):

.close-icon {
    list-style-image: url("chrome://global/skin/icons/close.svg") !important;
    -moz-image-region: rect(0px, 80px, 16px, 64px) !important;
}

.close-icon:hover {
    list-style-image: url(chrome://global/skin/icons/close.png) !important;
    -moz-image-region: rect(0, 32px, 16px, 16px) !important;
}

.close-icon[selected="true"] {
    list-style-image: url(chrome://global/skin/icons/close.png) !important;
    -moz-image-region: rect(0, 16px, 16px, 0) !important;
}

.close-icon[selected="true"]:hover {
    list-style-image: url(chrome://global/skin/icons/close.png) !important;
    -moz-image-region: rect(0, 32px, 16px, 16px) !important;
}

[shawndwells]

I'm hitting this on Fedora as well. Bump to get this merged.