fix(compat): add camelCase selectors to tab label wrapper (#5955)

* fix(compat): add camelCase selectors to tab label wrapper

* remove internally used dash-case

* remove uses of dash-case

src/lib/tabs/tab-group.html

@@ -3,7 +3,7 @@
                [disableRipple]="disableRipple"
                (indexFocused)="_focusChanged($event)"
                (selectFocusedIndex)="selectedIndex = $event">
-  <div class="mat-tab-label" role="tab" md-tab-label-wrapper md-ripple
+  <div class="mat-tab-label" role="tab" mdTabLabelWrapper md-ripple
        *ngFor="let tab of _tabs; let i = index"
        [id]="_getTabLabelId(i)"
        [tabIndex]="selectedIndex == i ? 0 : -1"

src/lib/tabs/tab-header.spec.ts

@@ -277,7 +277,7 @@ interface Tab {
     <md-tab-header [selectedIndex]="selectedIndex" [disableRipple]="disableRipple"
                (indexFocused)="focusedIndex = $event"
                (selectFocusedIndex)="selectedIndex = $event">
-      <div md-tab-label-wrapper style="min-width: 30px; width: 30px"
+      <div mdTabLabelWrapper style="min-width: 30px; width: 30px"
            *ngFor="let tab of tabs; let i = index"
            [disabled]="!!tab.disabled"
            (click)="selectedIndex = i">

src/lib/tabs/tab-label-wrapper.ts

@@ -19,7 +19,7 @@ export const _MdTabLabelWrapperMixinBase = mixinDisabled(MdTabLabelWrapperBase);
  * @docs-private
  */
 @Directive({
-  selector: '[md-tab-label-wrapper], [mat-tab-label-wrapper]',
+  selector: '[mdTabLabelWrapper], [matTabLabelWrapper]',
   inputs: ['disabled'],
   host: {
     '[class.mat-tab-disabled]': 'disabled'