In detail status view, display attachment uncropped if there's only one (#5054)

* In detail status view, display attachment uncropped if there's only one

* Make media spoiler the size of the media it hides, enable on static

package.json

@@ -95,6 +95,7 @@
     "react-router-dom": "^4.1.1",
     "react-router-scroll": "ytase/react-router-scroll#build",
     "react-simple-dropdown": "^3.0.0",
+    "react-sizeme": "^2.3.5",
     "react-swipeable-views": "^0.12.3",
     "react-textarea-autosize": "^5.0.7",
     "react-toggle": "^4.0.1",