优化buttun的字体

src/form/button.wc

@@ -31,6 +31,7 @@
     white-space: nowrap;
     background: #fff;
     font-size: inherit;
+    font-family: inherit;
     outline: none;
     color: inherit;
     cursor: inherit;

src/form/input.wc

@@ -52,6 +52,7 @@ li {
     border-radius: inherit;
     color: inherit;
     font-size: inherit;
+    font-family: inherit;
     background: none;
     outline: none;
     box-shadow: none;

src/layer/index.wc

@@ -154,6 +154,7 @@
       white-space: nowrap;
       background: #fff;
       font-size: inherit;
+      font-family: inherit;
       outline: none;
       color: inherit;