fixed focus border in mozilla (bug with focusring removal)

build/scss/_miscellaneous.scss

@@ -448,7 +448,7 @@ blockquote {
 // Remove Firefox Focusring
 a,
 button,
-input {
+input.btn {
   &:-moz-focusring {
     border: 0;
     outline: none;

dist/css/adminlte.css

@@ -26485,7 +26485,7 @@ blockquote.quote-gray-dark h6 {
 
 a:-moz-focusring,
 button:-moz-focusring,
-input:-moz-focusring {
+input.btn:-moz-focusring {
   border: 0;
   outline: none;
 }