Fix textarea text wrapping in Firefox

jet/static/jet/css/_forms.scss

@@ -93,7 +93,7 @@ textarea {
   height: auto;
   line-height: normal;
   padding: 12px;
-  white-space: normal;
+  white-space: pre-wrap;
 }
 
 .button, input[type="submit"], input[type="button"] {

jet/static/jet/css/themes/default/base.css

@@ -2301,7 +2301,7 @@ textarea {
   height: auto;
   line-height: normal;
   padding: 12px;
-  white-space: normal; }
+  white-space: pre-wrap; }
 
 input[type=checkbox] {
   display: none; }

jet/static/jet/css/themes/green/base.css

@@ -2332,7 +2332,7 @@ textarea {
   height: auto;
   line-height: normal;
   padding: 12px;
-  white-space: normal; }
+  white-space: pre-wrap; }
 
 input[type=checkbox] {
   display: none; }