Shorten

We don't have a CSP yet (it is report only, and there we already allow data:)

Ref:
- https://stackoverflow.com/questions/12168909/blob-from-dataurl

web/apps/photos/src/services/exif.ts

@@ -370,29 +370,14 @@ async function convertImageToDataURL(blob: Blob) {
     return dataURL;
 }
 
-function dataURIToBlob(dataURI: string) {
-    // convert base64 to raw binary data held in a string
-    // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
-    const byteString = atob(dataURI.split(",")[1]);
-
-    // separate out the mime component
-    const mimeString = dataURI.split(",")[0].split(":")[1].split(";")[0];
-
-    // write the bytes of the string to an ArrayBuffer
-    const ab = new ArrayBuffer(byteString.length);
-
-    // create a view into the buffer
-    const ia = new Uint8Array(ab);
-
-    // set the bytes of the buffer to the correct values
-    for (let i = 0; i < byteString.length; i++) {
-        ia[i] = byteString.charCodeAt(i);
-    }
-
-    // write the ArrayBuffer to a blob, and you're done
-    const blob = new Blob([ab], { type: mimeString });
-    return blob;
-}
+/**
+ * Convert a `data:` URI to a blob.
+ *
+ * Requires `connect-src data:` in the CSP (since it internally uses `fetch` to
+ * perform the conversion).
+ */
+const dataURIToBlob = (dataURI: string) =>
+    fetch(dataURI).then((res) => res.blob());
 
 function convertToExifDateFormat(date: Date) {
     return `${date.getFullYear()}:${