Remove outdated focus style fix (tailwindlabs#4780)

* Remove outdated focus style fix from Preflight

* Update fixtures

Author: adamwathan

src/plugins/css/preflight.css

@@ -29,16 +29,6 @@ button {
   background-image: none;
 }
 
-/**
- * Work around a Firefox/IE bug where the transparent `button` background
- * results in a loss of the default `button` focus styles.
- */
-
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-}
-
 fieldset {
   margin: 0;
   padding: 0;

tests/fixtures/tailwind-output-flagged.css

@@ -330,16 +330,6 @@ button {
   background-image: none;
 }
 
-/**
- * Work around a Firefox/IE bug where the transparent `button` background
- * results in a loss of the default `button` focus styles.
- */
-
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-}
-
 fieldset {
   margin: 0;
   padding: 0;

tests/fixtures/tailwind-output-important.css

@@ -330,16 +330,6 @@ button {
   background-image: none;
 }
 
-/**
- * Work around a Firefox/IE bug where the transparent `button` background
- * results in a loss of the default `button` focus styles.
- */
-
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-}
-
 fieldset {
   margin: 0;
   padding: 0;

tests/fixtures/tailwind-output-no-color-opacity.css

@@ -330,16 +330,6 @@ button {
   background-image: none;
 }
 
-/**
- * Work around a Firefox/IE bug where the transparent `button` background
- * results in a loss of the default `button` focus styles.
- */
-
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-}
-
 fieldset {
   margin: 0;
   padding: 0;

tests/fixtures/tailwind-output.css

@@ -330,16 +330,6 @@ button {
   background-image: none;
 }
 
-/**
- * Work around a Firefox/IE bug where the transparent `button` background
- * results in a loss of the default `button` focus styles.
- */
-
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
-}
-
 fieldset {
   margin: 0;
   padding: 0;