fix: align input backgrounds for code editors

public/app/core/components/code_editor/theme-grafana-dark.js

@@ -14,7 +14,7 @@ ace.define("ace/theme/grafana-dark",["require","exports","module","ace/lib/dom"]
   background: #555651\
   }\
   .gf-code-dark {\
-  background-color: #111;\
+  background-color: #09090b;\
   color: #e0e0e0\
   }\
   .gf-code-dark .ace_cursor {\

public/sass/components/_slate_editor.scss

@@ -13,7 +13,7 @@
   cursor: text;
   line-height: $line-height-base;
   color: $text-color;
-  background-color: $panel-bg;
+  background-color: $input-bg;
   background-image: none;
   border: $panel-border;
   border-radius: $border-radius;