Fix white border in dark themes (#2898)

* Fix white border in oblivion dark theme

* Fix white border in dark theme

* Fix white border in dark better theme

* Fix white border in material theme

Author: drrako

plugins/theme/themes/Dark/stable.css

@@ -4,6 +4,7 @@
   --header-border-color: #333333;
   /* --header-asc-icon: undefined - inherit from standard theme; */
   --col-resize-sep-bg-color: #a0a0a0;
+  --row-border-color: #333333;
   --row-odd-bg-color: #333333;
   --row-even-bg-color: #191919;
   --row-active-bg-color: #888888;

plugins/theme/themes/DarkBetter/stable.css

@@ -4,6 +4,7 @@
   --header-border-color: #333333;
   --header-asc-icon: url("data:image/svg+xml,%3csvg version='1' xmlns='http://www.w3.org/2000/svg' viewBox='0 0 48 48'%3e%3cpath fill='%232196F3' d='M43 17.1L39.9 14 24 29.9 8.1 14 5 17.1 24 36z'/%3e%3c/svg%3e");
   --col-resize-sep-bg-color: #a0a0a0;
+  --row-border-color: #333333;
   --row-odd-bg-color: #333333;
   --row-even-bg-color: #191919;
   --row-active-bg-color: #888888;

plugins/theme/themes/MaterialDesign/stable.css

@@ -58,6 +58,7 @@
   --header-border-color: transparent;
   --header-asc-icon: url(data:image/gif;base64,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);
   --col-resize-sep-bg-color: #a0a0a0;
+  --row-border-color: #1b1b1b;
   --row-odd-bg-color: #2A2A2A;
   --row-even-bg-color: #252525;
   --row-active-bg-color: #191919;

plugins/theme/themes/Oblivion/stable.css

@@ -4,6 +4,7 @@
   --header-border-color: transparent;
   --header-asc-icon: url(data:image/gif;base64,R0lGODlhEAAQAPQeAGZmZoeHh4WFhYCAgH9/f3p6enh4eHV1dXR0dHNzc2hoaGdnZ2RkZF1dXVZWVlVVVVNTU01NTUNDQzs7OzU1NSoqKigoKCUlJSIiIhYWFg4ODgwMDAYGBgMDAwAAAAAAACH5BAUAAB4ALAAAAAAQABAAAAU4oCeOZGmeaKqubDkBRiEby3RuUEIMxPFsKAyDIBgoLKmOBBEwRDoqTcPAyLAuDkqrU+G0vuBwKwQAOw==);
   --col-resize-sep-bg-color: #a0a0a0;
+  --row-border-color: #181818;
   --row-odd-bg-color: linear-gradient(0deg, #2c2c2c 0%, #272727 100%);
   --row-even-bg-color: linear-gradient(0deg, #222222 0%, #272727 100%);
   --row-active-bg-color: linear-gradient(0deg, #121212 0%, #464646 100%);