Reduce padding of header components

Extra padding caused the app header to take up more vertical room. This
change reduces that padding.

Change-Id: I9b31ebfa8c75f48123d9a58f32c2a438c9900857
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.html b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.html
index d1ae719..2c2fb4e 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.html
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.html
@@ -26,7 +26,7 @@
   <template>
     <style include="shared-styles">
       gr-dropdown {
-        padding: .5em;
+        padding: 0 .5em;
         --gr-button: {
           color: var(--header-text-color);
         }
diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.html b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.html
index 04e3794..5a4aaac 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.html
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.html
@@ -136,7 +136,7 @@
       }
       .loginButton {
         color: var(--header-text-color);
-        padding: 1em;
+        padding: .5em 1em;
       }
       .dropdown-trigger {
         text-decoration: none;