Attention, qimgv-mpv_v2_fix.patch is not mentioned in spec files as source or patch.

Attention, qimgv-mpv_v2_fix.patch is not mentioned in spec files as source or patch.

- Removing patch files which aren't needed since items were fixed upstream:
* qimgv-mpv_v2_fix.patch
* qimgv-no_return_in_nonvoid.patch

- Update to version 1.0.3a+git20220510.48dd2ea3:
* [cmake] fix default flags
* check for qt5 first
* .
* Update build-package.yml
* change release tag
* fix mpv include path
* [windows/msys2] add build script
* fix #410
* [windows] enable scripts/"open with" functionality #406 #236 #196
* [ContextMenu] compact layout
* [res] back/forward icons
* [ContextMenu] scripts/"open with.." page mockup #406 #236 Fix scripts with qt6
* [ImageViewerV2] tweak scroll handling
* [ThumbnailViewProxy] fix(?) event order
* fix Core::loadPath()
* delay model loading (test) #383 #156
* fix #384
* fix #392
* fix window close with qt 6.3 #394
* [cmake] qt detection tweak (prefer qt6); remove core5compat

- Commenting out the following 2 patches as the issues appear fixed upstream:
* qimgv-mpv_v2_fix.patch
* qimgv-no_return_in_nonvoid.patch
- Cleaning up 'Source0' definition.