software_keyboard: Signal state changed event upon construction

Previously, ILibraryAppletAccessor would signal upon creation of any applet, but this is incorrect. A flag inside of the applet code determines whether or not creation should signal state change and swkbd happens to be one of these applets.

src/core/hle/service/am/applets/software_keyboard.cpp

@@ -38,7 +38,12 @@ static Core::Frontend::SoftwareKeyboardParameters ConvertToFrontendParameters(
     return params;
 }
 
-SoftwareKeyboard::SoftwareKeyboard() = default;
+SoftwareKeyboard::SoftwareKeyboard() {
+    // Some applets require this to be signalled on applet creation, some do not. Internally, this
+    // is done by a flag in the applet module, but for simplicity SoftwareKeyboard is one of the
+    // applets with this flag.
+    broker.SignalStateChanged();
+}
 
 SoftwareKeyboard::~SoftwareKeyboard() = default;