refactor: remove redundant 'this' for cleaner templates (#32035)

Author: lekhmanrus

docs/src/app/pages/component-sidenav/component-nav.html

@@ -1,6 +1,6 @@
 <div class="docs-component-viewer-nav">
   @let items = (this.items | async) || [];
-  @let params = this._params | async;
+  @let params = _params | async;
 
   @if (items.length > 0) {
     <div class="docs-component-viewer-nav-content">

src/material/button-toggle/button-toggle.html

@@ -32,5 +32,5 @@
 <span class="mat-button-toggle-focus-overlay"></span>
 <span class="mat-button-toggle-ripple" matRipple
      [matRippleTrigger]="button"
-     [matRippleDisabled]="this.disableRipple || this.disabled">
+     [matRippleDisabled]="disableRipple || disabled">
 </span>

src/material/sort/sort-header.html

@@ -11,8 +11,8 @@
 <div class="mat-sort-header-container mat-focus-indicator"
      [class.mat-sort-header-sorted]="_isSorted()"
      [class.mat-sort-header-position-before]="arrowPosition === 'before'"
-     [class.mat-sort-header-descending]="this._sort.direction === 'desc'"
-     [class.mat-sort-header-ascending]="this._sort.direction === 'asc'"
+     [class.mat-sort-header-descending]="_sort.direction === 'desc'"
+     [class.mat-sort-header-ascending]="_sort.direction === 'asc'"
      [class.mat-sort-header-recently-cleared-ascending]="_recentlyCleared() === 'asc'"
      [class.mat-sort-header-recently-cleared-descending]="_recentlyCleared() === 'desc'"
      [class.mat-sort-header-animations-disabled]="_animationsDisabled"