fix: detect user-level flatpak mpv install (io.mpv.Mpv, not io.mpv/Mpv)

Fedora Workstation ships no mpv package by default (needs RPM Fusion,
off by default), so most Fedora users install mpv via Flatpak/GNOME
Software. The Linux player-detection path checked for a directory at
$HOME/.local/share/flatpak/app/io.mpv/Mpv/ (slash), but the real
Flatpak app-id directory uses dots throughout: io.mpv.Mpv. That check
could never match a real user-level flatpak install of mpv, so ani-cli
would die with "No player found. Looked for mpv and vlc" even when
mpv was correctly installed. Confirmed against live Flathub metadata
(flatpak remote-info io.mpv.Mpv -> Ref: app/io.mpv.Mpv/x86_64/stable)
and by simulating dep_ch_failover against both path forms.

The system-wide path (/var/lib/flatpak/app/io.mpv.Mpv/, added in
b0993d4) was already correct and is unchanged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: TigerShark900

ani-cli

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-version_number="5.0.1"
+version_number="5.0.2"
 
 # UI
 
@@ -407,7 +407,7 @@ case "$(uname -a | cut -d " " -f 1,3-)" in
         player_function="${ANI_CLI_PLAYER:-iSH}"
         curl_exe=$(dep_ch_failover "curl_safari260_ios,$curl_exe")
         ;;                                                                                                                                                                                               # iOS (iSH)
-    *) player_function="${ANI_CLI_PLAYER:-$(dep_ch_failover "mpv,$HOME/.local/share/flatpak/app/io.mpv/Mpv/,/var/lib/flatpak/app/io.mpv.Mpv/,vlc")}" || die 'No player found. Looked for mpv and vlc' ;; # Linux OS
+    *) player_function="${ANI_CLI_PLAYER:-$(dep_ch_failover "mpv,$HOME/.local/share/flatpak/app/io.mpv.Mpv/,/var/lib/flatpak/app/io.mpv.Mpv/,vlc")}" || die 'No player found. Looked for mpv and vlc' ;; # Linux OS
 esac
 
 player_extra_flags="${ANI_CLI_PLAYER_FLAGS:-""}"