Cspell: adjust letter case in word list

This probably isn't worth managing!

On the bright side, I've vetted most of the word list now.
There's some stupid words in there, but with reasons, generally.
Often stupid reasons.

cspell.json

@@ -18,7 +18,7 @@
 	"words": [
 		"Adlm",
 		"airb",
-		"Airbrushbrush",
+		"airbrushbrush",
 		"Allaire",
 		"anypalette",
 		"apng",
@@ -40,7 +40,7 @@
 		"cmaps",
 		"colorbar",
 		"colorbox",
-		"Colorstr",
+		"colorstr",
 		"contenteditable",
 		"Corel",
 		"ctype",
@@ -87,7 +87,7 @@
 		"hsrgb",
 		"humbnail",
 		"Icci",
-		"icns",
+		"ICNS",
 		"iconify",
 		"IFDs",
 		"iframes",
@@ -130,7 +130,7 @@
 		"Mopaint",
 		"Mousewheel",
 		"msapplication",
-		"mspaint",
+		"MSPaint",
 		"multitools",
 		"multitouch",
 		"multiuser",
@@ -156,7 +156,7 @@
 		"paintbucket",
 		"pako",
 		"palettized",
-		"peggys",
+		"Peggys",
 		"Phlp",
 		"Photoshop",
 		"pixeling",
@@ -176,7 +176,7 @@
 		"resizer",
 		"retarget",
 		"retargeted",
-		"rgba",
+		"RGBA",
 		"RGBAs",
 		"rightclick",
 		"rotologo",
@@ -194,9 +194,9 @@
 		"sketchpalette",
 		"skeuomorphic",
 		"sorthweast",
-		"soundcloud",
+		"SoundCloud",
 		"spacebar",
-		"Spirobrush",
+		"spirobrush",
 		"spraycan",
 		"spraypaint",
 		"spraypainting",
@@ -220,7 +220,7 @@
 		"togglable",
 		"topich",
 		"tracedata",
-		"tracky",
+		"Tracky",
 		"Tvcy",
 		"typestyles",
 		"undecagons",