Merge bitcoin-core/gui#6: Do not truncate node flag strings in debugwindow peers details tab

0ac09c9793 qt: Do not truncate node flag strings in debugwindow.ui peers details tab. (saibato)

Pull request description:

  Fix: When fiddling around with new node flags other than the usual.

  I saw that not all possible node flag strings i.e. the UNKNOWN[..] where
  visible in peers details tab.
  Since v18.2 fixed size was set to 300 and sliding is thereby limited.

  A fix on my old linux cruft and small screen was to set minimumSize width to -1 or 0.
  Qt will then autosize the slider to the max string length.

  Thereby i had full display of all flags inclusive sliding without to fullscreen the window.

  Not sure if this is even an issue for those who can afford big screens or high res macs?
  Feedback welcome.

  BTW: nice side effect now again easy to scroll trough long version names of the node.
  can't wait to see strings like /Satoshi:0.23.99/NOX2NOX4NOX32  or what ever fits in the version string.

ACKs for top commit:
  hebasto:
    ACK 0ac09c9793, tested on Linux Mint 20 (x86_64, Qt 5.12.8).
  promag:
    Tested ACK 0ac09c9793 on macos.

Tree-SHA512: a1601b5e35f10b1fd9407b28142ca00c1b985a822be5d23be4d7d3376211450f06e17f962c44b8b40977f8f8bbbb701cac1c5abb4afb3618da76385dfac848a3

src/qt/forms/debugwindow.ui

@@ -1078,12 +1078,6 @@
                 <height>426</height>
                </rect>
               </property>
-              <property name="minimumSize">
-               <size>
-                <width>300</width>
-                <height>0</height>
-               </size>
-              </property>
               <layout class="QGridLayout" name="gridLayout_2" columnstretch="0,1">
                <item row="0" column="0">
                 <widget class="QLabel" name="label_30">