Fix some flatpak typos

flatpak/com.github.Alcaro.Flips.json

@@ -21,7 +21,7 @@
             "buildsystem" : "simple",
             "build-commands": [
                 "sh make.sh --cflags=-DFLATPAK",
-                "make install"
+                "make install PREFIX=/app"
             ],
             "sources" : [
                 {

flips-gtk.cpp

@@ -1007,10 +1007,7 @@ int GUIShow(const char * filename)
 	button(0,0, "_Apply Patch", G_CALLBACK(a_ApplyPatch));
 	button(1,0, "_Create Patch", G_CALLBACK(a_CreatePatch));
 	button(0,1, "Apply and _Run", G_CALLBACK(a_ApplyRun));
-#ifdef FLATPAK
-	gtk_widget_set_sensitive(button, false);
-	gtk_widget_set_tooltip_text(button, "Running in emulators is not available in Flatpak");
-#endif
+	flatpakDisable(button);
 	button(1,1, "_Settings", G_CALLBACK(a_ShowSettings));
 #undef button