Heatmap: fix color scheme reversal (#56227) (#56233)

(cherry picked from commit eeb31c2)

Co-authored-by: Leon Sorokin <leeoniya@gmail.com>

public/app/plugins/panel/heatmap/palettes.ts

@@ -97,13 +97,16 @@ export function quantizeScheme(opts: HeatmapColorOptions, theme: GrafanaTheme2):
     }
 
     if (
-      opts.reverse ||
       scheme.invert === 'always' ||
       (scheme.invert === 'dark' && theme.isDark) ||
       (scheme.invert === 'light' && theme.isLight)
     ) {
       palette.reverse();
     }
+
+    if (opts.reverse) {
+      palette.reverse();
+    }
   }
 
   return palette;