portico: Fix cursor set to pointer incorrectly for input elements.

This commit fixes the code which incorrectly set the cursor
property to "pointer" for input and textarea elements where
only select elements should have it. The code causing this bug
was added in d708bc338.

static/styles/portico/portico_signin.css

@@ -512,7 +512,6 @@ html {
             border-radius: 4px;
             background-color: hsl(0, 0%, 100%);
             color: hsl(0, 0%, 33%);
-            cursor: pointer;
 
             transition: border 0.3s ease;
 
@@ -575,6 +574,7 @@ html {
            right above this one is also 326px. */
         select {
             width: 326px;
+            cursor: pointer;
         }
 
         p.text-error {