adjust appearance of cell toolbar select

undo some of the bootstrap mixin sizing,
which should help the appearance on Firefox on Linux.

IPython/html/static/notebook/less/celltoolbar.less

@@ -50,9 +50,12 b''
 .celltoolbar select {
     .form-control();
     .input-sm();
+    // undo some of the sizing caused by the above mixins
     width: inherit;
-    font-size: 87%;
+    font-size: inherit;
     height: 22px;
+    padding: 0px;
+    
     display: inline-block;
 
 }

IPython/html/static/style/style.min.css

@@ -10525,8 +10525,9 b' p {'
   line-height: 1.5;
   border-radius: 1px;
   width: inherit;
-  font-size: 87%;
+  font-size: inherit;
   height: 22px;
+  padding: 0px;
   display: inline-block;
 }
 .celltoolbar select:focus {