Fastfetch: adds interactive --gen-config mode

removes `--gen-config-*` flags (merged into `--gen-config`)

src/common/ffdata.h

@@ -19,4 +19,5 @@ typedef struct FFdata {
     FFstrbuf genConfigPath;      // Path to generate configuration file
     FFDataResultDocType docType; // Type of result document
     bool configLoaded;
+    bool genConfigInteractive; // `--gen-config` entered the interactive CUI
 } FFdata;