Update modals to use more consistent padding—modal body and footer now match modal header

dist/css/bootstrap.css

@@ -5184,10 +5184,10 @@ button.close {
 }
 .modal-body {
   position: relative;
-  padding: 20px;
+  padding: 15px;
 }
 .modal-footer {
-  padding: 19px 20px 20px;
+  padding: 15px;
   text-align: right;
   border-top: 1px solid #e5e5e5;
 }

less/modals.less

@@ -98,7 +98,7 @@
 
 // Footer (for actions)
 .modal-footer {
-  padding: (@modal-inner-padding - 1) @modal-inner-padding @modal-inner-padding;
+  padding: @modal-inner-padding;
   text-align: right; // right align buttons
   border-top: 1px solid @modal-footer-border-color;
   &:extend(.clearfix all); // clear it in case folks use .pull-* classes on buttons

less/variables.less

@@ -558,7 +558,7 @@
 //##
 
 //** Padding applied to the modal body
-@modal-inner-padding:         20px;
+@modal-inner-padding:         15px;
 
 //** Padding applied to the modal title
 @modal-title-padding:         15px;