Override pinned context hint text (#479)

This change overrides/hides the pinned context hint text which is incorrectly shown for Eclipse as the shortcut key already exists. In a future change, an appropriate shortcut key and hint text will be configured

Author: shruti0085

plugin/src/software/aws/toolkits/eclipse/amazonq/providers/assets/ChatWebViewAssetProvider.java

@@ -176,7 +176,8 @@ function refreshUi() {
                                     disclaimerAcknowledged: %b,
                                     pairProgrammingAcknowledged: %b,
                                     agenticMode: true,
-                                    modelSelectionEnabled: true
+                                    modelSelectionEnabled: true,
+                                    stringOverrides: { pinContextHint: '' },
                                 });
                                 window.mynah = mynahUI
                             })