[Button] Set line-height to 'auto' globally

Signed-off-by: Lee Calcote <lee.calcote@layer5.io>

Author: leecalcote

src/custom/SearchBar.tsx

@@ -57,6 +57,13 @@ const customTheme = (theme: Theme) =>
             }
           }
         }
+      },
+      MuiButton: {
+        styleOverrides: {
+          root: {
+            lineHeight: 'auto'
+          }
+        }
       }
     }
   });