Update rustdoc-gui tests for search-input border color on dark theme

Author: GuillaumeGomez

src/test/rustdoc-gui/search-form-elements.goml

@@ -92,7 +92,7 @@ reload:
 assert-css: (
     ".search-input",
     {
-        "border-color": "rgb(240, 240, 240)",
+        "border-color": "rgb(224, 224, 224)",
         "background-color": "rgb(240, 240, 240)",
         "color": "rgb(17, 17, 17)",
     },

src/test/rustdoc-gui/search-input.goml

@@ -3,7 +3,7 @@ goto: file://|DOC_PATH|/test_docs/index.html
 local-storage: {"rustdoc-use-system-theme": "false", "rustdoc-theme": "dark"}
 reload:
 
-assert-css: (".search-input", {"border-color": "rgb(240, 240, 240)"})
+assert-css: (".search-input", {"border-color": "rgb(224, 224, 224)"})
 click: ".search-input"
 assert-css: (".search-input", {"border-color": "rgb(0, 141, 253)"})