Fix: libdnf5-cli: TransactionSummary counters data type

Fixes "error: implicit conversion changes signedness: 'const int' to
'unsigned long' [-Werror,-Wsign-conversion]"
The bug was caused by commit "I18N: Mark messages in "dnf install" output
for a translation"

libdnf5-cli/output/transaction_table.cpp

@@ -186,14 +186,14 @@ class TransactionSummary {
     }
 
 private:
-    int installs = 0;
-    int reinstalls = 0;
-    int upgrades = 0;
-    int downgrades = 0;
-    int removes = 0;
-    int replaced = 0;
-    int reason_changes = 0;
-    int skips = 0;
+    unsigned int installs = 0;
+    unsigned int reinstalls = 0;
+    unsigned int upgrades = 0;
+    unsigned int downgrades = 0;
+    unsigned int removes = 0;
+    unsigned int replaced = 0;
+    unsigned int reason_changes = 0;
+    unsigned int skips = 0;
 };