Fix file line padding in side-by-side viewer

Setting "padding: 0" on td was overriding the padding of the
actual CSS class we tried to apply, because its selector was higher
priority.  Instead only set padding-top,-bottom as that is what we
need to control the per-row gaps.

Change-Id: I8c5d83d4b4c08dc7197edee9614390ae50424544
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
index 5ee4a61..4f482dc 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
@@ -517,7 +517,8 @@
   border-spacing: 0;
 }
 .patchContentTable td {
-  padding: 0;
+  padding-top: 0;
+  padding-bottom: 0;
   font-size: 8pt;
   font-family: mono-font;
 }
@@ -594,9 +595,9 @@
 }
 
 .fileLine {
-  padding-left: 0.2em;
+  padding-left: 0;
+  padding-right: 0;
   white-space: pre;
-  padding-right: 0.2em;
 }
 .fileLineNone {
   background: #eeeeee;