Bug 1584074 - Fix CodeMirror token color issue due to update to v5.49.0. r=gl.

The last update of the CodeMirror library introduced new
CSS selectors in the css file with a greater specificity than
they used to, which means the color property we set in our
themes css files weren't applied.
We change the selectors in our theme files so they are more
specific than the ones in codemirror's css file.

Differential Revision: https://phabricator.services.mozilla.com/D47291

--HG--
extra : moz-landing-system : lando

devtools/client/themes/dark-theme.css

@@ -181,7 +181,9 @@ body {
   background: transparent;
 }
 
-.CodeMirror.cm-s-mozilla  pre {
+.CodeMirror.cm-s-mozilla  pre,
+.CodeMirror.cm-s-mozilla  pre.CodeMirror-line,
+.CodeMirror.cm-s-mozilla  pre.CodeMirror-line-like {
   color: var(--theme-text-color-strong);
 }
 

devtools/client/themes/light-theme.css

@@ -179,6 +179,8 @@ body {
 }
 
 .CodeMirror.cm-s-mozilla  pre,
+.CodeMirror.cm-s-mozilla  pre.CodeMirror-line,
+.CodeMirror.cm-s-mozilla  pre.CodeMirror-line-like,
 .cm-s-mozilla .cm-variable-3,
 .cm-s-mozilla .cm-operator,
 .cm-s-mozilla .cm-special {