App improvements (#103)

Tactility/Source/app/imageviewer/ImageViewer.cpp

@@ -8,7 +8,7 @@ namespace tt::app::imageviewer {
 
 #define TAG "image_viewer"
 
-static void on_show(App& app, lv_obj_t* parent) {
+static void onShow(App& app, lv_obj_t* parent) {
     lv_obj_set_flex_flow(parent, LV_FLEX_FLOW_COLUMN);
     lvgl::toolbar_create(parent, app);
 
@@ -35,7 +35,7 @@ extern const Manifest manifest = {
     .id = "ImageViewer",
     .name = "Image Viewer",
     .type = TypeHidden,
-    .onShow = &on_show
+    .onShow = onShow
 };
 
 } // namespace