fix: improve tab selection for collapsed folders, p=#9977

Co-authored-by: Mr. M <mr.m@tuta.com>
Co-authored-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>

src/zen/workspaces/ZenGradientGenerator.mjs

@@ -1090,11 +1090,7 @@
       }
       let opacity = this.currentOpacity;
       if (forToolbar && !this.#allowTransparencyOnSidebar) {
-        color = this.blendColors(
-          color.c,
-          this.getToolbarModifiedBaseRaw().slice(0, 3),
-          opacity * 100
-        );
+        color = this.blendColors(color.c, this.getToolbarModifiedBaseRaw().slice(0, 3), 90);
         opacity = 1; // Toolbar colors should always be fully opaque
       } else {
         color = color.c;