Bundled Themes: Twenty Twenty image caption is not aligned center when image is, on the front-end.

Fixes the image caption alignment issue by adding `text-align: center;` to `.wp-block-image .aligncenter figcaption`.

Props markusthiel, SergeyBiryukov, garethgillman.
Fixes #49320.

git-svn-id: https://develop.svn.wordpress.org/trunk@47689 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentytwenty/style-rtl.css

@@ -5847,6 +5847,10 @@ a.to-the-top > * {
 	.wp-block-image .alignright {
 		margin-left: 0;
 	}
+  
+    .wp-block-image .aligncenter figcaption {
+        text-align: center;
+    }
 
 	/* BLOCK: SEPARATOR */
 

src/wp-content/themes/twentytwenty/style.css

@@ -5917,6 +5917,10 @@ a.to-the-top > * {
 		/*rtl:ignore*/
 		margin-left: 0;
 	}
+  
+    .wp-block-image .aligncenter figcaption {
+        text-align: center;
+    }
 
 	/* BLOCK: SEPARATOR */