[piexwasm] Add white space to piex.cpp wasm code GetDetails()

Add minor white space for better readability. GetDetails() returns the
EXIF photographic details of the RAW image. piex-loader.js cleans this
data later (remove trailing string null bytes and trim left and right,
reformat floating point and integer numbers) for eventual presentation
to users (in the FilesApp Quick View metadata info box for example).

The color space names used are presentation names (sRGB, AdobeRGB1998)
not values. The piex color space values are 'sRgb' and 'adobeRgb', and
this note to point out the difference.

Test: piex/tests.sh PASS
Tbr: adanillo
No-try: true
Bug: 1132695
Change-Id: Ic80765334c0a78a18bd0cbdd2c114cbb16658cee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454354Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814590}

ui/file_manager/image_loader/piex/piex.cpp

@@ -86,12 +86,13 @@ class PiexReader {
     object.set("width", emscripten::val(image.full_width));
     object.set("height", emscripten::val(image.full_height));
     object.set("orientation", emscripten::val(image.exif_orientation));
+
     object.set("colorSpace", emscripten::val("sRGB"));
     const auto space = static_cast<uint32_t>(image.color_space);
     if (space == piex::PreviewImageData::kAdobeRgb)
       object.set("colorSpace", emscripten::val("AdobeRGB1998"));
-    object.set("date", emscripten::val(image.date_time));
 
+    object.set("date", emscripten::val(image.date_time));
     return object;
   }