Bug 1735326 - Use solid rather than dashed border in two flexbox tests. r=dholbert

Longer term fix, I don't think this impacts the validity of the test in
any way and should avoid antialiasing artifacts.

Differential Revision: https://phabricator.services.mozilla.com/D128201

Author: emilio

testing/web-platform/meta/css/css-flexbox/flexbox-align-self-vert-001.xhtml.ini

@@ -12,7 +12,7 @@
     <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"/>
     <style>
       .flexbox {
-        border: 1px dashed blue;
+        border: 1px solid blue;
         width: 200px;
         font-size: 10px;
       }

testing/web-platform/meta/css/css-flexbox/flexbox-align-self-vert-rtl-001.xhtml.ini

@@ -13,7 +13,7 @@
     <link rel="match" href="flexbox-align-self-vert-001-ref.xhtml"/>
     <style>
       .flexbox {
-        border: 1px dashed blue;
+        border: 1px solid blue;
         width: 200px;
         display: flex;
         flex-direction: column;

testing/web-platform/tests/css/css-flexbox/flexbox-align-self-vert-001-ref.xhtml

@@ -13,7 +13,7 @@
     <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"/>
     <style>
       .flexbox {
-        border: 1px dashed blue;
+        border: 1px solid blue;
         width: 200px;
         direction: rtl;
         font-family: sans-serif;

testing/web-platform/tests/css/css-flexbox/flexbox-align-self-vert-001.xhtml

@@ -14,7 +14,7 @@
     <link rel="match" href="flexbox-align-self-vert-rtl-001-ref.xhtml"/>
     <style>
       .flexbox {
-        border: 1px dashed blue;
+        border: 1px solid blue;
         width: 200px;
         display: flex;
         flex-direction: column;