[BUG] VTextField persistent placeholder still enabled in disabled VCard

[jymc77]

Hello,

When a VTextField with a persistent placeholder is inside a VCard and the VCard is disabled, we can still click on the placeholder. This is due to the VTextField having a permanent v-label--active class when the persistent-placeholder attribute is used :

.v-text-field .v-label--active {
    ...
    pointer-events: auto;
}

which overrides :

.v-card--disabled {
    pointer-events: none;
}