Fix pixel alignment for some composer icons (#29372)

app/javascript/styles/mastodon/components.scss

@@ -669,12 +669,12 @@ body > [data-popper-placement] {
     }
 
     .icon-button.compose-form__upload__delete {
-      padding: 3px;
+      padding: 2px;
       border-radius: 50%;
 
       .icon {
-        width: 18px;
-        height: 18px;
+        width: 20px;
+        height: 20px;
       }
     }
 
@@ -720,12 +720,12 @@ body > [data-popper-placement] {
     }
 
     .icon-button {
-      padding: 3px;
+      padding: 2px;
     }
 
     .icon-button .icon {
-      width: 18px;
-      height: 18px;
+      width: 20px;
+      height: 20px;
     }
   }