Add ppidetst to build

- ppidetst was updated to TASM syntax and is now built automatically
- completed the function within ppidetst to dynamically set the PPI base port address
- cleaned up the formatting a bit

Source/Apps/Build.cmd

@@ -22,6 +22,7 @@ call :asm Timer || goto :eof
 call :asm180 IntTest || goto :eof
 call :asm rtcds7 || goto :eof
 call :asm rtchb || goto :eof
+call :asm ppidetst || goto :eof
 
 zx Z80ASM -SYSGEN/F