refactor(text-editor): no need to be so specific for default styles

We were adding specificity of "if not `readonly`" then these
are the colors. But further down, we actually specified colors for the
readonly mode. So this was an overkill. Also would complicate styles
for next commit, for the `disabled` state.

src/components/text-editor/text-editor.scss

@@ -11,6 +11,9 @@
 }
 
 :host(limel-text-editor) {
+    --limel-text-editor-outline-color: #{shared_input-select-picker.$lime-text-field-outline-color};
+    --limel-text-editor-background-color: #{shared_input-select-picker.$background-color-normal};
+    --limel-text-editor-label-color: #{shared_input-select-picker.$label-color};
     --limel-text-editor-padding: 0.75rem 1rem;
     position: relative;
     isolation: isolate;
@@ -24,12 +27,6 @@
     max-height: 100%;
 }
 
-:host(limel-text-editor:not([readonly])) {
-    --limel-text-editor-outline-color: #{shared_input-select-picker.$lime-text-field-outline-color};
-    --limel-text-editor-background-color: #{shared_input-select-picker.$background-color-normal};
-    --limel-text-editor-label-color: #{shared_input-select-picker.$label-color};
-}
-
 :host(limel-text-editor:hover) {
     --limel-text-editor-outline-color: #{shared_input-select-picker.$lime-text-field-outline-color--hovered};
 }