css: align read-only values with the input fields

The System Settings rows all pair a label with a form control, except Model,
which is a bare span. The inputs carry padding and a left margin, so their
text starts about 32px further in than the model name did - close enough to
look like a mistake and far enough to see it.

Give read-only values a class with the same metrics instead of styling the
model specifically; any other value shown without a control gets the
alignment for free.

html/style.css

@@ -82,6 +82,8 @@ object, img {
 .isNOK{ color: #900;}
 .isOK{ color: #090;}
 .ip{padding:8px 16px;margin-bottom: 1em;margin-left: 1em}
+/* read-only values line up with the text inside the input fields */
+.rotext{display:inline-block;padding:8px 16px;margin-bottom: 1em;margin-left: 1em}
 .row {display: flex;}
 .rcol {flex: 90%;}
 .lcol {flex: 10%;}