Migrate away from unsigned integer types

Signed integers should be preferred in these cases.

src/app/stacktrace.h

@@ -12,7 +12,7 @@
 #include <vector>
 
 /** Print a demangled stack backtrace of the caller function to FILE* out. */
-static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames = 63)
+static inline void print_stacktrace(FILE *out = stderr, const int max_frames = 63)
 {
     fprintf(out, "Stack trace:\n");
 

src/base/search/searchpluginmanager.h

@@ -36,7 +36,7 @@
 #include "base/path.h"
 #include "base/utils/version.h"
 
-using PluginVersion = Utils::Version<unsigned short, 2>;
+using PluginVersion = Utils::Version<short, 2>;
 Q_DECLARE_METATYPE(PluginVersion)
 
 namespace Net