Added appropriate delete statements.

src/dawn/ui/UIBorder.cpp

@@ -131,4 +131,8 @@ glm::vec2 UIBorder::getInnerSize() {
 
 glm::vec2 UIBorder::getBorderSize() {
   return this->edgeDimensions;
+}
+
+UIBorder::~UIBorder() {
+  delete this->texture;
 }