Page injection doesn't work; remove it

Page injection requires opening extension popup, which requires the browser to be managed in the first place.

pages/settings.htm

@@ -27,12 +27,6 @@
 										<span for="settings_general_showApplicable"></span>
 									</label>
 								</li>
-								<li>
-									<label>
-										<input type="checkbox" data-store="settings,general,injectToPage" class="filled-in" data-store-location="1" />
-										<span for="settings_general_injectToPage"></span>
-									</label>
-								</li>
 							</ul>
 						</section>
 						<section class="input-group">