Improve swatch table overflow handling

Add overflow:auto to the three swatch tables to allow for scrolling if the amount of inputs exceeds the available space and increase the min width of inputs (150px) within the table for better usability. 

Intentionally left original input width (50px) as a fallback.

Author: Cyanoxide

app/code/Magento/Swatches/view/adminhtml/web/css/swatches.css

@@ -153,6 +153,18 @@
     min-width: 65px;
 }
 
+[class^=swatch-col],
+[class^=col-]:not(.col-draggable):not(.col-default) {
+    min-width: 150px;
+}
+
+#swatch-visual-options-panel,
+#swatch-text-options-panel,
+#manage-options-panel {
+    overflow: auto;
+    width: 100%;
+}
+
 .data-table .col-swatch-min-width input[type="text"] {
     padding: inherit;
 }