Merge #425: build: Add missed icon file to resources

6138805 qml: Add missed icon file to resources (Hennadii Stepanov)

Pull request description:

  This PR fixes [build](https://github.com/bitcoin-core/gui-qml/actions/runs/11076549194/job/30779860142#step:7:1634) on macOS 13 `x86_64`:
  ```
  RCC: Error in 'qml/bitcoin_qml.qrc': Cannot find file 'res/icons/minus.png'
  ```

ACKs for top commit:
  jarolrod:
    ACK 6138805
  johnny9:
    ACK 6138805

Tree-SHA512: 990ce26f6185e439a45ac42a3f07d180383d7b1380d29fb72a17e21a8852d2cc1db40d124a9262704ade523e38516cd48bc5393af0c8de7b866dc7ff3c4b0d8d

Author: hebasto

src/Makefile.qt.include

@@ -344,6 +344,7 @@ QML_RES_ICONS = \
   qml/res/icons/gear-outline.png \
   qml/res/icons/hidden.png \
   qml/res/icons/info.png \
+  qml/res/icons/minus.png \
   qml/res/icons/network-dark.png \
   qml/res/icons/network-light.png \
   qml/res/icons/plus.png \