Use NcTextField, provide MDI search icon - NC25 Compatibility

As of NC25 application has to provide their own icons, see [here](nextcloud/server#32060)
The switch to NcTextField allows easy to use their wrapper for the same result than previous code
Use the MDI AccountSearchIcon which feels more appropriate than a simple magnifier

css/style.scss

@@ -53,31 +53,8 @@ table tr td:first-child {
 
  .search-container {
  position: relative;
-
- input {
- width: calc(100% - 24px);
- margin: 14px 12px;
- padding: 5px 25px;
- background: transparent url('../img/search.svg?v=1') no-repeat 5px center;
- }
-
- .abort {
- opacity: 0.5;
- transition: opacity 0.5s;
- background: transparent var(--icon-close-000) no-repeat center;
- background-size: auto;
- background-size: 100%;
- width: 20px;
- height: 20px;
- position: absolute;
- right: 16px;
- top: 20px;
- cursor: pointer;
- }
-
- .abort:focus, .abort:hover, .abort:active {
- opacity: 0.8;
- }
+ width: calc(100% - 24px);
+ margin: 12px 12px 5px 12px;
  }
 
  .select-group {