undo accidental changes to cdktable's ngAfterContentChecked hook

Author: kseamon

src/cdk/table/table.ts

@@ -500,6 +500,10 @@ export class CdkTable<T> implements AfterContentChecked, CollectionViewer, OnDes
     // connection has already been made.
     if (this.dataSource && this._rowDefs.length > 0 && !this._renderChangeSubscription) {
       this._observeRenderChanges();
+    } else if (stickyColumnStyleUpdateNeeded) {
+      // In the above case, _observeRenderChanges will result in updateStickyColumnStyles being
+      // called when it row data arrives. Otherwise, we need to call it proactively.
+      this.updateStickyColumnStyles();
     }
 
     this._checkStickyStates();