finish landing 92331: plaintext mailquoting improvements.

editor/ui/composer.js

@@ -72,7 +72,7 @@ pref("editor.singleLine.pasteNewlines",     1);
 
 pref("editor.history.url_maximum", 10);
 
-pref("editor.quotesPreformatted",            true);
+pref("editor.quotesPreformatted",            false);
 
 pref("editor.publish.",                      "");
 

modules/libpref/src/init/editor.js

@@ -72,7 +72,7 @@ pref("editor.singleLine.pasteNewlines",     1);
 
 pref("editor.history.url_maximum", 10);
 
-pref("editor.quotesPreformatted",            true);
+pref("editor.quotesPreformatted",            false);
 
 pref("editor.publish.",                      "");